Asked by lily

So the problem is
9 = w + (-8)
I know the answer is 17.
But I don't know how I solve it/show work.
Answered by Reiny
What would happen if you add 8 to both sides of your equation ?
Answered by lily
It becomes 17?
But usually with problems like these aren't you supposed to subtract since it's an addition problem?
Answered by Ms. Sue
You need to get the knowns on one side and the unknowns on the other side. Move the -8 to the other side of the equation. To do that, add 8 to both sides.

9 = w + (-8)
9 + 8 = w + (-8) + 8
17 = w



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