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**With Rational Functions**

Solving Word Problems With Rational Functions

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**Minds On Page 287 #11 Basic premise**

Selling price - cost price = profit R(x) - C(x) = P(x)

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**Setting it up Determine the cost per book**

Let x represent the number of books she purchased. The cost per book will be

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**Setting it up She gives 15 to her brother and sells the rest for $330**

Her revenue per book will be 330 x-15

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**Equation Revenue - Cost = Profit R(x) - C(x) = P(x)**

330/x /x = 1.5 Solve for x to determine the number of comic books in the box. Substitute this answer into the cost expression to get the original price of each book.

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1.3 Solving Systems by Substitution. Steps for Substitution 1.Solve for the “easiest” variable 2.Substitute this expression into the other equation 3.Solve.

1.3 Solving Systems by Substitution. Steps for Substitution 1.Solve for the “easiest” variable 2.Substitute this expression into the other equation 3.Solve.

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