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x varies directly as y. If x is 9 when y is 4, find x when-y is 8.
a) Write the variation.
b) Find x when y is 8.
a) How are these two variables related?
i oo
OD. x=ky
b) The quantity indicated is

Respuesta :

Answer:

see explanation

Step-by-step explanation:

Given x varies directly as y then the equation relating them is

x = ky ← k is the constant of variation

To find k use the condition x = 9 when y = 4

k = [tex]\frac{x}{y}[/tex] = [tex]\frac{9}{4}[/tex] = 2.25

x = 2.25y ← equation of variation

When y = 8, then

x = 2.25 × 8 = 18

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