## Precalculus (6th Edition) Blitzer

Equations are equivalent if they have equal solution sets. $\left[\begin{array}{ll} 3y-1=11 & 3y-7=5\\ 3y=12 & 3y=12\\ y=4 & y=4 \end{array}\right]$ Both equations have the solution set $\{4\}$, so, the statement is true.