ANSWER
y = 15
EXPLANATION
We have that y = -9 when x = 3.
To find y when x is -5, we have to use ratio.
We have that the ratio of y to x is:
y : x = -9 : 3 = y : -5
That is:
[tex]\begin{gathered} -9\text{ : 3 = y : -5} \\ \Rightarrow\text{ }\frac{-9}{3}\text{ = }\frac{y}{-5} \\ \text{Cross}-\text{multiply:} \\ -9\cdot\text{ -5 = 3 }\cdot\text{ y} \\ y\text{ = }\frac{-9\cdot\text{ -5}}{3} \\ y\text{ = 15} \end{gathered}[/tex]That is the value of y when x is -5.
