Question

Y varies directly affects if y equals negative five when x equals 15 find X when y equals three

Answer 1

Well,

We are given a direct proportion problem.

x varies directly as y.


`(x)/(y)`

When y = -5, x = 15.

`(15)/(-5) \ or\ (3)/(-1)`

Now, we are told to find x when y = 3.


`(x)/(3)`

We just have to recognize that the complete case is equal to the incomplete case. In other words, we set the -3 equal to the x/3.


`(3)/(-1) = (x)/(3)`

Multiply both sides by the LCM.
LCM of -1 and 3 = 3

-9 = x

When y = 3, x = -9.