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Math help? Use substitution to solve the linear system.

0 votes

4. 4x + 3y = 31, y=2x+7

5. -12x + y = 15 ,3x+2y=3

6.) x+1/2y=7 ,3x+2y=18 

asked Aug 25, 2015 in ALGEBRA 2 by anonymous

3 Answers

0 votes

(4)

The equations are image and image.

Substitute image in image.

image

image

image

image

image

image

Substitute image in image.

image

image

Therefore, the solutions are imageand image.

answered Aug 25, 2015 by lilly Expert
0 votes

(5)

The equations are image and image.

Consider the equation image.

Solve for image.

image

Substitute image in image.

image

image

image

image

image

image

Substitute image in image.

image

image

image

Therefore, the solutions are image and image.

answered Aug 25, 2015 by lilly Expert
0 votes

(6)

The equations are image and image.

Consider the equation image.

Solve for image.

image

image

image

Substitute image in image.

image

image

image

image

Substitute image in image.

image

image

image

Therefore, the solutions are image and image.

answered Aug 25, 2015 by lilly Expert

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