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Monica [59]
3 years ago
9

If the value of “y” varies directly with “x” and y = -8 when x = 20, find “y” if x = -4.

Mathematics
2 answers:
schepotkina [342]3 years ago
8 0

Answer:

8

Step-by-step explanation:

natali 33 [55]3 years ago
3 0

Answer:

y = \frac{8}{5}

Step-by-step explanation:

Given 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 = - 8 when x = 20

k = \frac{y}{x} = \frac{-8}{20} = - \frac{2}{5}

y = - \frac{2}{5} x ← equation of variation

When x = - 4, then

y = - \frac{2}{5} × - 4 = \frac{8}{5}

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