mahraalirashid mahraalirashid
  • 17-04-2021
  • Mathematics
contestada

Suppose that y varies directly with x and y=20 , when x =8

a : write a direct variation equation that relates x and y ??

b : find y when x =3 ??

Respuesta :

jimrgrant1 jimrgrant1
  • 17-04-2021

Answer:

y = 7.5

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 = 20 when x = 8

20 = 8k ( divide both sides by 8 )

2.5 = k

(a)

y = 2.5x ← equation of variation

(b)

When x = 3 , then

y = 2.5 × 3 = 7.5

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