Chapter 2 - Functions, Equations, and Graphs - 2-4 More About Linear Equations - Practice and Problem-Solving Exercises - Page 86: 24

$3x+5y=15$

Using the properties of equality, in the form $Ax+By=C$ or the Standard Form of Linear Equations, the given equation is equivalent to: \begin{align*} \dfrac{3}{5}x+y&=3 \\\\ 5\left( \dfrac{3}{5}x+y \right)&=(3)5 \\\\ 3x+5y&=15 \end{align*}