The points {(-2, 1), (0, 3), (1, 2)} are on the graph of function f. What are the coordinates of these three points after a vertical stretch by a factor of 2?

a. {(-4, 1), (0, 3), (2, 2)}
b. {(-2, 1/2), (0, 3/2), (1, 1)}
c. {(-1, 1), (0, 3), (1/2, 2)}
d. {(-2, 2), (0, 6), (1, 4)}

Question

The points {(-2, 1), (0, 3), (1, 2)} are on the graph of function f. What are the coordinates of these three points after a vertical stretch by a factor of 2?

a. {(-4, 1), (0, 3), (2, 2)}
b. {(-2, 1/2), (0, 3/2), (1, 1)}
c. {(-1, 1), (0, 3), (1/2, 2)}
d. {(-2, 2), (0, 6), (1, 4)}

anonymous · Answer

@phi

anonymous · Answer

I chose answer C

anonymous · Answer

but, from what you told me before, I am thinking it is answer choice D

phi · Answer

vertical stretch does not affect the x

phi · Answer

yes D looks good.  x is the same,  y's are "stretched" by a factor of 2

anonymous · Answer

Yup! Thank you! this helped a lot. I'll have to let my teacher know about the lesson plan not shedding much light on this subject!