Question

The black graph is the graph of

y = f(x). Choose the equation for the
red graph.
a. y = f(2x)
b. y=f)
C. 2y = f(x)
d. = f(x)

Answer 1

9514 1404 393

Answer:

c. 2y = f(x)

Explanation:

Each point on the red graph is half the distance from the x-axis as the same point on the black graph. That is, the vertical scale factor is 1/2:

y = (1/2)f(x)

Multiplying this equation by 2 gives one that matches an answer choice:

2y = f(x)