SOLUTION: For each of the following, find an equation of variation in which y varies directly as x and the following are true. y=20, when x=4 y=30, when x =3 y=0.7, when x=0.4

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Question 203701: For each of the following, find an equation of variation in which y varies directly as x and the following are true.
y=20, when x=4
y=30, when x =3
y=0.7, when x=0.4
Answer by RAY100(1637) About Me  (Show Source):
You can put this solution on YOUR website!
Remember direct variation has the form,,,y = kx
.
1) 20 = 4k,,,,,k=5,,,,,y=5x
.
2) 30 = 3k,,,,,k=10,,,,,y=10x
.
3) .7 = .4k,,,,k=1.75,,,,,y=1.75x
.