## Algebra: A Combined Approach (4th Edition)

Answer (a): $\frac{1}{2}$ Answer (b): $9$
Part (a): We substitute $x=2$ and $y=-5$ into the expression $\frac{x-y}{12+x}$. The expression becomes $\frac{2-(-5)}{12+2}$. Simplifying, we get $\frac{2-(-5)}{12+2}$=$\frac{2+5}{14}$=$\frac{7}{14}$=$\frac{1}{2}$ Part (b): We substitute $x=2$ and $y=-5$ into the expression $x^{2}-y$. The expression becomes $2^{2}-(-5)=4+5=9$.