Question

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​

Answer 1

A. 5, -2

Ap.e.x

Answer 2

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