3 years ago

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

Mathematics

2 answers:

Lady bird [3.3K]3 years ago

8 0

Answer:

X becomes 4

Step-by-step explanation:

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

-2 x -2 = 4

Semenov [28]3 years ago

6 0

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

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