# How do you simplify: 4(x + 5y) + 5x + y?

Nov 8, 2016

$9 x + 21 y$

#### Explanation:

Step 1) Expand the term in parenthesis:

$4 \left(x + 5 y\right) + 5 x + y \implies$

$4 x + 20 y + 5 x + y$

Step 2) Combine like terms and simplify:

$4 x + 5 x + 20 y + y \implies$

$\left(4 + 5\right) x + \left(20 + 1\right) y \implies$

$9 x + 21 y$