Algebra practice question

Answer: 3

Substitute x = 4: 12 + 2y = 18, so 2y = 6 and y = 3.

Common wrong answers

If you answered 2

Check the arithmetic: 18 − 12 = 6, and 6 ÷ 2 = 3.

If you answered 6

6 is the value of 2y; divide by 2 to get y = 3.

If you answered 9

9 is y when x = 0 (the y-intercept); with x = 4, y = 3.

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