Algebra practice question

Answer: 31

Slope = (19 − 7)/(6 − 2) = 3. From f(6) = 19, f(10) = 19 + 3(4) = 31.

Common wrong answers

If you answered 25

25 adds only 6 to 19, using half the change in x.

If you answered 29

29 uses slope 2.5 from a subtraction slip.

If you answered 38

38 doubles f(6), treating f as proportional.

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