If y varies inversely with x and y = 5 when x=20 find x when y = - 4

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Mathematics

31 October, 19:16

If y varies inversely with x and y = 5 when x=20 find x when y = - 4

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Answers (1)

Know the Answer?

Obie · Answer 1

x=-25

Step-by-step explanation:

Inverse variation

xy = k

We know x and y

20*5 = k

100 = k

So the formula is

x y = 100

We know y = - 4

x (-4) = 100

Divide each side by - 4

-4x/-4 = 100/-4

x = - 25