Question

does the data in the table represent a direct variation or an inverse variation?
X 1 3 4 7
y 5 15 20 35

A. Direct variation; y=1/5x*******
B. Inverse variation xy=5
C. Direct variation y=5x
D. Inverse variation xy=1/5

Answer 1

correct

Answer 2

huh? y = 5x

Answer 3

oops.
of course!
there is that "oldtimers" problem