How do you solve x - 2y = -2 and y = 2x + 4 by substitution?

1 Answer
Dec 5, 2015

x=-2 and y=0

Explanation:

x-2y=-2

This implies x=2y-2

Substitute this value of x in the other equation i.e y=2x+4
y=2(2y-2)+4
y=4y
This implies y=0

Substitute this in the first equation
x-2(0)=-2
This implies x=-2