Answer
-7
Work Step by Step
$\frac{5y-x}{-y}$ $\longrightarrow$ substitute given values
=$\frac{5(1)-(-2)}{-1}$ $\longrightarrow$ multiply
=$\frac{5+2}{-1}$ $\longrightarrow$ simplify numerator
=$\frac{7}{-1}$ $\longrightarrow$ divide
=$-7$