Question

Solve the system of equations by the substitution method. y=5x+7 y=7x+8

Answer 1

x = -0.5 y = 4.5

Explanation:

on both equations you have 1 side that only is y.
so those sides are equal.
Therefore you can do
5x+7=7x+8 and then solve for x
-2x + 7 = 8
-2x = 1
x = -0.5

then insert this into any of the equations and you solve for y:
y = 5*0.5+7
y = -2.5 + 7
y = 4.5