Overage minute(X) is 15min of which 6min outside local area and 9min inside it.
So Overage chagre(Y) = 6*($0.13) + 9*($0.06) = (0.78 + 0.54)
Overage Charge(Y) = $1.32
If X=0 , then Y is also 0,
So we have to find slope between two points (0,0) & (15,1.32)
Slope = (1.32-0)/(15-0) = 1.32/15 = 0.088
So, slope = 0.088
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