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

Jul 9, 2016

$2 x + 7 = 5 x + 4$

Subtract $2 x$ from both sides, giving us

$\left(2 x - 2 x\right) + 7 = \left(5 x - 2 x\right) + 4$

$7 = 3 x + 4$

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

$3 = 3 x$, so $x = 1$