SOLUTION: Im not sure if i picked the topic right but will someone please help me with this question? y varies directly as x if y= 30 when x is 8, find the equation of variation

Question 825528: Im not sure if i picked the topic right but will someone please help me with this question?
y varies directly as x if y= 30 when x is 8, find the equation of variation
Answer by nerdybill(7384) (Show Source): You can put this solution on YOUR website!

y varies directly as x if y= 30 when x is 8, find the equation of variation
.
"direct variation":
y = kx
.
from: "if y= 30 when x is 8" we get
30 = k(8)
30/8 = k
15/4 = k
.
equation of variation is:
y = (15/4)x

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