Use the substitution method to solve the system of equations. 3x+7y=1 y=x-7 A. 5,-2 B. 3,-4 C. 4,-3 D. 2,-5

Question

asked Jan 28, 2021 34.5k views

2 Answers

Malina · Answer 1 · 2021-02-02T18:14:34+0000

Answer:

A x=5 y=-2

Explanation:

y = x − 7 ; 3 x + 7 y = 1

y = x - 7

Substitute

x − 7 for y in 3 x + 7y = 1:

3x + 7y = 1

3x + 7(x-7) = 1

10x - 49 = 1

10x = 50

x = 5

Substitute:

y = 5 - 7

y = -2