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the value of x varies directly with the value of y and when x=3 y= -9 write an equation to represent the direct variation.​

the value of x varies directly with the value of y and when x3 y 9 write an equation to represent the direct variation class=

Respuesta :

Answer:

y = - 3x

Step-by-step explanation:

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

y = kx ← k is the constant of variation

To find k use the condition y = - 9 when x = 3

k = [tex]\frac{y}{x}[/tex] = [tex]\frac{-9}{3}[/tex] = - 3

y = - 3x ← equation of variation