Question

How do you solve `y=2x+7` and `y=5x+4` using substitution?

Answer 1

`2x+7=5x+4`

Subtract `2x` from both sides, giving us

`(2x-2x)+7=(5x-2x)+4`

`7=3x+4`

Subtract `4` from both sides, which finally gives us

`3=3x`, so `x = 1`