Mathematics High School

substitiution method i really need help

Substitiution Method I Really Need Help

Answers

Answer 1

Answer:

x = 7

y = 0

Step-by-step explanation:

Equation:  2x - 9y = 14

We are given that x = -6y + 7

So we substitute (-6y + 7) for "x" in the equation  2x - 9y = 14

* substitute *

2 ( -6y + 7 ) - 9y = 14

now we solve for y using basic algebra

step 1 distribute the 2

2 * -6y = -12y

2 * 7 = 14

now we have -12y + 14 - 9y = 14

step 2 combine like terms

-12y - 9y = -21y

now we have -21y + 14 = 14  

step 3 subtract 14 from each side

14 - 14 cancels out

14 -14 = 0

now we have -21y = 0

step 4 divide each side by -21

-21y / -21 = y

0 / -21 = 0

we're left with y = 0

now to find x

To find x we substitute 0 for "y" in x = -6y + 7

* substitute *

x = -6 ( 0 ) + 7

-6 * 0 = 0

we're left with x = 7

Related Questions

A sequence defined by the rule f(n)=4f(n-1)+2.if f(1)=3 then find f(4)=?

Answers

Answer:

f(4) = 6

Step-by-step explanation:

Given the rule f(n) = 4f (n - 1) + 2 where f(1) = 3, f(n) is just a fancy way to name the variable y. As you've seen before, there are equations that are usually y equals x and something. For example:

y = mx + b

is the same thing as

f(n) = y = mn + b.

It might be that you have multiple of the same equation where f(n) and f(x) have two different outcomes.

The f(n) part (bolded) is the "x variable" in this equation. So in f(1), n = 1.

f(n) = 4f (n - 1) + 2

f(n) = (4fn - 4f) + 2

f(n) = (n) + 2

f(1) = 1 +2

3 = 3

Now do the same thing for f(4):

f(n) = 4f (n - 1) + 2

f(n) = (4fn - 4f) + 2

f(n) = (n) + 2

f(4) = 4 + 2

f(4) = 6

In the quadratic equation x2 - 8x + a = 0; what is the value, a, in order to form a perfect square?

Answers

Answer:

16

Step-by-step explanation:

(x - y)² = x² - 2xy + y²

x = x and y = a

2xy = 8x

2*x*a = 8x

     a = [tex]\frac{8x}{2x}[/tex]

a = 4

a²  = 16

Bob can paint a fence in 12 hours, and working with Jen can paint a fence in 4 hours. How long would it have taken Jen to paint the fence alone?

Answers

Answer:

6 hours

Step-by-step explanation:

For Bob

12 hours = 1 fence

1 hour = 1/12 fence

Together Bob and Jen

4 hours = 1 fence

1 hour = 1/4 fence

Now, for Jen:

1 hour = 1/4 - 1/12= 3/12 - 1/12 = 2/12=1/6

Find the amount of time Jen will need:

1/6 fence = 1 hour

1 fence = 6 hour

Can you please help meeeeeeee

Answers

The outlier would be 68

PLS HELP WILL GIVE BRAIN THINGY

Answers

Answer:

Teachers are tough

Step-by-step explanation:

your welcome i hope you do good in ur test! :)

In ASTU, the measure of angle U=90°, SU = 33, TS = 65, and UT = 56. What is the value
of the tangent of angle S to the nearest hundredth?

Answers

Answer:

Step-by-step explanation:

someone help me out. explain maybe

Answers

3rd option would be correct in my opinion

HELP!!! ANYONE!! ASAP!!!

Answers

Answer:

A

Step-by-step explanation:

I'm not going to give an explanation but for next time, the stem is the tens place and the leaf is the ones place.

The area of a square room is 256 square feet. What is the length of one wall?

Answers

Answer: The length of one wall is 16ft

Step-by-step explanation: √256=16ft

Answer:

64ft

Step-by-step explanation:

256 divided by 4 since it is a square they are all even corners.

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Answers

The answer to this is n= 4

what is the value of 6(2b-4) when b+5?

Answers

Answer:

The value of 6(2b-4) is 36.

Step-by-step explanation:

Given expression: 6(2b-4)

To find the value of 6(2b-4) at b=5, we need to substitute the b=5 in the expression, we get

6(2(5)-4)

= 6(10-4)

=6(6)

= 6x6=36

⇒ 6(2(5)-4)=36

Answer:

The value of 6(2b-4) when b=5 is 36.

Step-by-step explanation:

Given expression: 6(2b-4). To find the value of 6(2b-4) at b= 5, we need to substitute the b=5 in the expression, we get….Therefore, the value of 6(2b-4) is 36, when b=5.

Use SAS to explain why ∆XYZ ≅ ∆VWZ !!!!!!!!!! Answer correctly !!!!!!!!!!! Will mark Brianliest !!!!!!!!!!!!

Answers

because they both come accordingly to eachother on the triangles segment points

Solve for x
triangle abc is similar to triangle aed

Answers

Answer:

9/5 or 1.8

Step-by-step explanation:

triangle aed is larger than triangle abc by a scale factor of 5; we know this because side ed is 5 units and cb, the corresponding side in triangle abc, is 1. if ad has a length of 9, the length of ab must be 9 divided by five. thus, z is equal to 9/5 or 1.8.

Someone plz help giving brainliest

Answers

Answer:

you just have to simply 15/28 then din your answer for tje model from there

Help! I will give me the brainiest!

Answers

Answer:

48 Ounces of red

Step-by-step explanation:

4+3=7

112/7= 16

you will need to add 3 ounces of red and 4 ounces of blue 16 times

16 x 3 (ounces of red)= 48

Which ordered pair is the solution to the system of linear equations y= -7x+2 and. y=9x - 14

A (-5,1)
B (1,-5)
C (5, -1)
D (-1,5P

Answers

The answer is (1,-5), If you put those two on a graph, that point is where they collide.



What is the measure of the internal angle H' of the image in degrees

Answers

Answer:

40 degrees

Step-by-step explanation:

- All internal angles of a triangle add up to 180 degrees.

- A right angle is 90 degrees.

90+50=140

subtract 140 from 180, which is 40 degrees.

A store sells a television for $1000. There are two payment options. Which option is better? ( PLS HELP!! I'M RLY STRUGGLING!! :< )

Answers

One of the options is $500+$500

Find the midpoint of the segment with the following endpoints.
(−9,2) and (−5,−6)

Answers

Answer:

(-7, -2)

Step-by-step explanation:

The bottom edge of a 16-foot long cantilever is given by the equation y = 2Vx, where y is the distance the

bottom edge is from ground height, in feet.

y

(a) What is the value of b, the height of the

cantilever, in feet?

b

T

y=2&x

b) To the nearest tenth of a foot, what is the

thickness, T, of the cantilever at x =6 feet?

Answers

Answer:

[tex](a)\ b = 8[/tex]

[tex](b)\ T = 3.1[/tex]

Step-by-step explanation:

Given

[tex]y = 2\sqrt x[/tex]

See attachment

Solving (a): Find b

At point b, [tex]x = 16[/tex]

So, the value of b is:

[tex]b = 2 * \sqrt{16[/tex]

[tex]b = 2 * 4[/tex]

[tex]b = 8[/tex]

Solving (b): Find T

First, we calculate the value of y at point T

[tex]y = 2\sqrt x[/tex]

At point T, [tex]x = 6[/tex]

So:

[tex]y = 2 * \sqrt 6[/tex]

[tex]y = 2 * 2.45[/tex]

[tex]y = 4.9[/tex]

To calculate T, we subtract the calculated height (y) from the value of b

[tex]T =b - y[/tex]

[tex]T = 8 - 4.9[/tex]

[tex]T = 3.1[/tex]

Write an equation for a line perpendicular to f(x)=5x−1 and passing through the point (5,20)

Answers

Answer:

y - 20 = (-1/5)(x - 5)

Step-by-step explanation:

The slope of the given line is 5.  The slope of any line perpendicular to the given line is the negative reciprocal of the given slope:  

Slope of perpendicular line here is -1/5.

We use the point-slope formula as a framework here:

y - 20 = (-1/5)(x - 5)

ASAP, REALLY EASY If x = -3 then what is -x

Answers

Answer:

3

because it says -3

so yeah

atleast i hope Im so bad at math

-3

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It costs $50 every two days to rent a bike. The amount y (in dollars) is proportional to the number x of days the bike is rented. a. Find the rate of change (slope) in simplest form. b. Write an equation that represents the situation. c. How many dollars will you pay for renting the bike 6 days?

Answers

Answer:

y=mx + c

Step-by-step explanation:

you find the answer using this equation

A
5

B
10

C
6

D
4
pls help

Answers

Answer:

Pretty sure it's C.

Step-by-step explanation:

A and B are 6 units away from each other.

Answer:

C

Step-by-step explanation:

Count the boxes

4. Find
A) 64.5
B) 68.5
C) 72.5
D) 76.5

Answers

Answer:

A) 64.5

Step-by-step explanation:

A circle's measurement is 360°.

It is given that arcPQ is 113° and arcQM is 118°. Subtract 113 and 118 from 360:

360 - (113 + 118) = 129°

ArcPM is 129 degrees. Note that this is a inscribed, but not a central angle. m∠PQM = (ArcPM)/2

m∠PQM = (129)/2

m∠PQM = 64.5

A) 64.5 is your answer.

~

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Answers

Answer:

90 degrees

Step-by-step explanation:

Answer:

x=103

Step-by-step explanation:

sum=(n-2)*180

sum=(6-2)*180

sum=4*180

sum=720

90+155+112+120+140+x=720

617+x=720

x=720-617

x=103

If g(x) = −3x + 4, what is the value of g(−3)?
A. 13
B. 5
C. −5
D. -13

Answers

G(-3)=-3(-3)+4= -5
The g(-3)= -5

Answer:

13

Step-by-step explanation:

g(x) = -3x + 4

g(-3) = -3 × -3+4

g(-3) = 9 + 4

g(-3) = 13 ........

3. solve (-7) + b = (-11)

Answers

B= -4 hope this helps!!!

The polygons in each pair are similar. Find the missing side length.
A.5
B.6
C.11
D.8

Answers

B po ang sagott sana makatulong po

Josh went for a drive in his new car. He drove for 6 hours at a speed of 38.4 miles per hour. How many miles did he drive​

Answers

6hours
At 38.4 miles per hour
So times 6 times 38.4 will give you the miles so he drove 230.4
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