Solve for x: 2x + 5 = 15.

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Multiple Choice

Solve for x: 2x + 5 = 15.

Explanation:
To solve this, you want to get x by itself. There’s a plus five on x, so undo that by subtracting 5 from both sides: 2x = 10. Then undo the multiplication by 2 by dividing both sides by 2, giving x = 5. If you plug it back in, 2(5) + 5 equals 10 + 5, which is 15, so it works. Other numbers don’t fit because they don’t make the left side equal to 15—for example, 7.5 would give 20, -5 would give -5, and 10 would give 25.

To solve this, you want to get x by itself. There’s a plus five on x, so undo that by subtracting 5 from both sides: 2x = 10. Then undo the multiplication by 2 by dividing both sides by 2, giving x = 5. If you plug it back in, 2(5) + 5 equals 10 + 5, which is 15, so it works. Other numbers don’t fit because they don’t make the left side equal to 15—for example, 7.5 would give 20, -5 would give -5, and 10 would give 25.

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