## Algebra 1: Common Core (15th Edition)

$y=x+7$ $y=2x+1$ Multiply the first equation by $-1$ so that the y values will cancel, then you'll have $0=x-6$ and you can add 6 to both sides where $x=6$. Then plug in 6 for the x value in either of the equations above $y=(6)+7$ so $y=13$.