If the value of y varies directly with X and Y equals -51 when x equals 3 find y if x equals 2

Answer 1

When it is said that a variable varies directly with another, it is saying that the equation Y = kX is obeyed where k is a proportionality constant.

The problem says that Y = -51 when X = 3, so place these values into the first equation and solve for k.

k = -51 / 3 = -17.

We can rewrite the original equation as such Y = -17 x X.

So, if X =2 then Y = -17 x 2 = -34