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.

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