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

y =

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 = = = -

y = - x ← equation of variation

When x = - 4, then

y = - × - 4 =

b. x + 1

step-by-step explanation:

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