If the ordered pairs graphed are all equivalent ratios, what ordered pair is missing?
a) (3,4)
b) (3,6)
c) (4,4)
d) (4,6)

click on the pic below

The answer is D because The ordered pairs graphed are (2,3), (6,9), and (8,12). They all have a ratio of 2 to 3. Which means each point is 2 larger on the x-axis and 3 larger on the y-axis than the previous point. The point that is missing is (4,6) since 2 + 2 = 4 and 3 + 3 = 6.