Answer
2
Work Step by Step
Evaluate $\frac{x-y}{3}$ when x is twice y and x is 12.
Write an expression for y in terms of x.
$2y=x\longrightarrow$ Divide both sides by 2.
$2y\div2=x\div2\longrightarrow$ Simplify.
$y=\frac{x}{2}$
Substitute for y in the original formula.
$\frac{x-y}{3}=\longrightarrow$ Substitute for y in the original formula.
$\frac{x-\frac{x}{2}}{3}=\longrightarrow$ Substitute 12 for x.
$\frac{12-\frac{12}{2}}{3}=\longrightarrow$ Solve
$\frac{12-6}{3}=$
$\frac{6}{3}=$
$2$
