Question

Find the value of y for a given value of x, if y varies directly with x

Answer 1

`y=-222`

Explanation:

When "y varies directly with x" this means that:

`y=k* x`

where k is a number we need to find out (called the constant of proportionality if you care about that).

We can figure out what k is because they tell us when y= -252, x=84. Substituting those values into our equation we get:

`-252 = k * 84`

and therefore:

`k=-3`.

So our equation or formula between y and x is:

`y= -3x`.

So when x = 74, then:

`y=-3 * 74 = -222`