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Pavel [41]
3 years ago
13

If y varies directly with x, and y = 2 when x = −4, what is the value of y when x = 20 ?

Mathematics
2 answers:
balu736 [363]3 years ago
8 0

Answer:

y=kx

2=k.-4

k=-1/2

then

y=-1/2×20

y=-10

ASHA 777 [7]3 years ago
6 0

Answer:

y = - 10

Step-by-step explanation:

Given that y varies directly with x then the equation relating them is

y = kx ← k is the constant of variation

To find k use the condition y = 2 when x = - 4, that is

2 = - 4k ( divide both sides by - 4 )

\frac{2}{-4} = k, that is

k = - \frac{1}{2}

y = - \frac{1}{2} x ← equation of variation

When x = 20, then

y = - \frac{1}{2} × 20 = - 10

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