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Greg is a software salesman. His monthly salary is $1700 plus an additional $80 for every copy of Math is Fun he sells. Let S represent his total salary this month (in dollars), and let N represent the number of copies of Math id Fun he sells. Write an equation relating S and N, and then graph your equation using the axes below.

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Answer:

» Assume it is a direct proportionality:

[tex]{ \rm{N \: \alpha \: \: S}}[/tex]

» Fomulate the equation:

[tex]{ \rm{N = kS}}[/tex]

» When N is 1, S is $1700 + 80

[tex]{ \rm{1 = k(1700 + 80)}} \\ { \tt{k = \frac{1}{1780} }}[/tex]

» Equation becomes:

[tex]{ \rm{N = \frac{S}{1780} }} \\ \\ { \boxed{ \rm{ \red{ \:S = 1780N }}}}[/tex]

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