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 ??

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

d≈7.07in

step-by-step explanation:

right

step-by-step explanation: