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

9x + 11y

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

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To simplify the expression (2x - 9y + 7x + 20y), combine like terms:

(2x + 7x - 9y + 20y = (2x + 7x) + (-9y + 20y) = 9x + 11y)

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