Question

If y varies directly as x, find the constant of variation if y = 5 when x = -0.1.


-0.5

0.5

50

-50
If y varies directly as x, find the constant of variation if y = 12 when x = one-third .


12

4

6

36
If y varies inversely as x, and y = 10 as x = 7, find y for the x-value of 10.


3

2

6

7

Answer 1

Let's remember what direct variation is:\[y=kx\] where k is the constant of variation.

And inverse variation:\[y = \frac{ k }{ x }\]