8. Rational Expressions and Equations

Add the following and simplify the sum if possible.

$\frac{2}{5}+\frac{3}{5}$

Add the following and simplify the sum if possible.

$\frac{x}{7}+\frac{4x}{7}$

Subtract the following and simplify the difference if possible.

$\frac{5}{8}-\frac{3}{8}$

Subtract the following and simplify the difference if possible.

$\frac{4y}{3}-\frac{-5y}{3}$