Question

let y=a/(bx^2). Describe how y will change.
a.) double a, keeping b and x constant.
b.) double x, keeping a and b constant.

Answer 1

a

Answer 2

a) If you double a, then,
\[y_{new}=2a/(bx^2)=2y\]so y duplicates its value.
b) If you double x, then
\[y_{new}=a/(b(2x)^2)=a/(4bx^2)=y/4\]so y gets divides by 4.