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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