16Hit1600
AlgebraVery hardLinear function from a doubling relation

Algebra practice question

The linear function g satisfies g(1) = 4 and g(3) = 2·g(1). What is the value of g(5)?

Answer: 12

g(3) = 8, so the slope is (8 − 4)/2 = 2 and g(5) = 8 + 2(2) = 12.

Common wrong answers

If you answered 10
10 uses slope 1.
If you answered 16
16 doubles g(3), but g is linear, not exponential.
If you answered 20
20 uses g(5) = 5·g(1).

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