# How do you simplify 2x-9y+7x+20y?

Jan 10, 2016

9x + 11y

#### Explanation:

To simplify the expression collect 'like terms'.

ie. collect together the terms which contain the same variable by adding or subtracting their coefficients.

so 2x + 7x - 9y + 20y = ( 2 + 7 )x + (- 9 + 20 )y

= 9x + 11y