Question

Solve this system of equation using substitution y=2x-4 x+2y=10

Answer 1

Y=2x-4
X+2y=10

Put y into the x equation
X+2(2x-4) =10

Expand and simplify
X+4x-8=10
5x-8 =10
5x=10+8
5x=18
X=18/5

Insert x into the original equation to get y
Y=2x-4
Y=2(18/5)-4
Y=16/5

Answer 2

I'm terrible at explaining so here's some screenshots

- Ripper

Explanation: