Question

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

Answer 1

Answer:

$y=-222$

Step-by-step explanation:

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

$y=k\times x$

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:

$-252 = k \times 84$

and therefore:

$k=-3$.

So our equation or formula between y and x is:

$y= -3x$.

So when x = 74, then:

$y=-3 \times 74 = -222$