Question

Solve the system by the method of substitution.

y = 3x + 8
y = 2x + 7

A. (1, 9)

B. (–1, 5)

C. (1, 11)

D. (11, 1)

Answer 1

y = 2x + 7

3x+8 = 2x + 7 ... replace y with 3x+8 (since y = 3x+8)

3x-2x = 7-8

x = ???

Answer 2

-1

Answer 3

if x = -1, then

y = 3x + 8

y = 3*(-1) + 8

y = ??

Answer 4

5

Answer 5

correct, so (x,y) = (-1, 5)