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Vlada [557]
3 years ago
5

Y varies inversely with x. If y = -8 when x = -7, find the y when x=-4.

Mathematics
1 answer:
lora16 [44]3 years ago
8 0

Answer:

y =-14

Step-by-step explanation:

Inverse variation is of the form

xy = k where k is a constant

(-7)(-8) = k

56 = k

The equation is

xy = 56

Let x = -4

(-4)y = 56

y = 56/-4

y =-14

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Hey!
The formula of direct variation is y = kx. So we know that p = kr^2
Hint: after it says varies, it's basically the equal sign. 
so we can set it up
56 = 4^2k
56=16k
now we want k alone so we have to divide 16 on both sides
k=3.5
We can now solve for p like it asks
p = 3.5*6^2
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There's your answer!
Hope this helps!
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