Question

Suppose the graph of y=f(x) contains the point (9,7). Then the point (1,7) must be on the graph of which of the following?

Answer 1

(a) y=9f(x)
(b) y=f(9x)
(c) y=f(x-8)
(d) y=f(1/9x)
(e) y=f(x)-8

Answer 2

i guess b

Answer 3

since
\[f(9)=7\] and therefore
\[f(9\times 1)=f(9)=7\]

Answer 4

B is right
f(1) = 7
f(1x9) = 7