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# What is the equation for Graph B? Use C for hours in class and S for hours studying. Use * to indicate multiplication ?

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- PuzzlingLv 71 month ago
We can see that there is a direct relationship between the two.

The both start at zero. Then as the number of hours in class (C) increases, the number of hours studying (S) increases in a linear fashion.

That means the S is some constant multiplier of C.

S = kC

But what is that multiplier?

Looking at the chart,

when C = 2, S = 1

when C = 4, S = 2

when C = 6, S = 3

when C = 8, S = 4

when C = 10, S = 5

It's pretty obvious that the time studying is exactly half of the time in class.

S = ½C

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