### Home > CC1MN > Chapter 10 > Lesson 10.1.2 > Problem10-20

10-20.

Rewrite each expression with an equivalent expression. Then evaluate each expression for $x=3$ and $y=1$.

1. $3x(5y−4)$

Multiply what is within the parentheses by what lies on the outside.

$15xy − 12x$

Substitute in the known values.

$15(3)(1) − 12(3)$

$9$

1. $7y^2+28y$

Factor out the $7y$.

1. $(2x−1)+(4x−3)$

• First combine like terms to write an equivalent expression.
Then substitute in the known values.