Question

if y varies directly as x and y = 540 when x= 10, find x when y = 1080

Answer 1

y = kx

Answer 2

y = kx is the formula for direct variation

Answer 3

540 = 10k

Answer 4

54 = k

Answer 5

1080 = 54x

Answer 6

1080/54 = x

Answer 7

x =20

Answer 8

540 = k(10)
Divide both sides by 10
54 = k

Answer 9

1080 = 54 x
1080/54 = x

Answer 10

x = 20

Answer 11

The equation for Direct Variation is y=kx