## Precalculus (6th Edition) Blitzer

A linear equation in one variable x is an equation that can be written in the form $ax+b=0$ where $a$ and $b$ are real numbers, and $a\neq 0$ Examples: $3x+7=2x-1,\quad$ because we can write it as $x+8=0$ $4x=3,\quad$ because we can write it as $4x-3=0$