Question

Solve the system of equations using substitution.

y=2x-10
y=4x-8

Answer 1

First solve for x(or y) in one of the equations

Since we already know y=4x-8, lets put that into the first equation

y=2x-10
(4x-8)=2x-10

Solve for x

2x=-2
x=-1

Now plug -1 in for x on one of the other equations

y=2(-1)-10
y=-2-10=-12

So we know that x=-1 and y=-12