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

Use mental math to solve $x-3=10$ Answer: $x=13$
Given equation: $x-3=10$ Think what number minus 3 equals 10 $x-3=10$ solution: $x=13$ check: $13-3=10$ So, $x=13$ is a solution of the equation $x-3=10$ $x=13$