Question

Determine the constant of variation for the direct variation given.

R varies directly with S. When S is 16, R is 80

Answer 1

The formula for direct variation, as y varies directly with x, is y=Kx. So when R varies directly with S, the formula would be R=KS, K being the constant of variation. All you have to do now, is substitute in the values and solve for x.
R=80, S=16, K=?
80=(16)K
K=5
The constant of variation is 5.

Answer 2

Thank you!