Question

For the data in the table, tell whether y varies directly with x. If it does, write an equation for the direct variation.

x 2 3 4 5
y -6.6 -9.9 -13.2 -16.2

Answer 1

Answer: no direct variation

Answer 2

It is direct variation if x/y is a constant.

x/y = 2 / -6.6 = -1/3.3

y/x = -9.9/3 = -3.3

y/x = -6.6/ 2 = -3.3

y/x = -13.2/ 3 = -3.3

y/x = -16.2/ 3 = -3.24

So its not exactly direct variation as the last values is slightly different from the first 3.