Question

If y=mx, and y is 12 when x is 4, then what is the constant of proportionality in this equation?A. 1/3B. 3C. 8D. 16

Answer 1

$\begin{gathered} y=mx\text{ when x=4 and y=12} \\ 12=m(4) \\ 4m\text{ =12} \\ m=\frac{12}{4}=3 \end{gathered}$

The constant of proportionality,m, is 3 (option B)