CPM Homework Help : PC3 Problem 4-19

Solve the system: $\begin{aligned}[t] x^2+y^2=25 \\ xy=12 \end{aligned}$

Step 1:

Rewrite the second equation as:

$y=\frac{12}{x}$

Step 2:

Substitute the expression for $y$ from Step 1 into the top equation.