Question

Y varies directly as x. If y=4 when x=16 find x when y = -2

Answer 1

Answer:

X becomes 4

Step-by-step explanation:

The function is $x^{2} = y$

so

-2 x -2 = 4

Answer 2

Answer:

-8 = x

Step-by-step explanation:

"y varies directly as x" translates into y = kx, where k is the constant of proportionality.

We are told that when x = 16, y = 4.  Thus, 4 = k(16), and k = 1/4.

Then y = (1/4)x.

If y = -2, what is x?    -2 = (1/4)x.

Multiplying both sides by 4 eliminates the fraction:

-8 = x