What is 9-3x-(-8y)+9x-y ?

The solution to 9-3x-(-8y)+9x-y is 6x+7y+9

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simplify 9-3x-(-8y)+9x-y

simplify

9 - 3 x - (- 8 y) + 9 x - y

6 x + 7 y + 9

Solution steps

9 - 3 x - (- 8 y) + 9 x - y

Apply rule:

a - (- b) = a + b

- 3 x - (- 8 y) = - 3 x + 8 y

= 9 - 3 x + 8 y + 9 x - y

Group like terms

= - 3 x + 9 x + 8 y - y + 9

Add similar elements:

- 3 x + 9 x = 6 x

= 6 x + 8 y - y + 9

Add similar elements:

8 y - y = 7 y

= 6 x + 7 y + 9

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