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An internet start-up predicts its revenue by a straight-line method with a slope of $7000 per month. In its 6 th month it had revenues of $45000. Find an equation for the revenue R as a function of the number of months T.

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CastleRook
Given that the method of revenue calculation is straight line method, the equation modeling this will be given by:
y=mx+c
where:
m=slope
x=time
c=initial value.
 from our question:
slope,m=$7000
time=T
y(x)=R(t)
hence the formula after the sixth month will be:
R(t)=7000T+45000




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