16Hit1600
Advanced MathEasy–Mediumy-intercept after a vertical stretch

Advanced Math practice question

The graph of y = 2ˣ in the xy-plane is stretched vertically by a factor of 3. What is the y-intercept of the new graph?

Answer: 3

The new equation is y = 3 · 2ˣ, and at x = 0 its value is 3 · 1 = 3.

Common wrong answers

If you answered 1
1 is the y-intercept of the original graph.
If you answered 6
6 is 3 · 2, evaluating at x = 1.
If you answered 8
8 is 2³, cubing instead of stretching.

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