Solve for x: -8x = 72.

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Multiple Choice

Solve for x: -8x = 72.

Explanation:
Isolating the variable by undoing the operation on x is the idea. Here x is multiplied by -8, so undo that by dividing both sides by -8. 72 ÷ -8 equals -9, so x = -9. Check: -8 times -9 equals 72, which matches. The other numbers won’t work because substituting them gives -64, -72, or 64, not 72.

Isolating the variable by undoing the operation on x is the idea. Here x is multiplied by -8, so undo that by dividing both sides by -8. 72 ÷ -8 equals -9, so x = -9. Check: -8 times -9 equals 72, which matches. The other numbers won’t work because substituting them gives -64, -72, or 64, not 72.

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