Solving Rational Equations Section 7.5 beginning on page 392

Solving by Cross Multiplying When you have two equal ratios, their cross products are equal. Example 1: Solve CHECK:

Solving by Using the LCD Example 3a : Solve ** Multiply each term by the LCD. ** Simplify ** Solve ** Check

Solving by Using the LCD Example 3b: Solve

Solving an Equation With an Extraneous Solution Example 4: Solve

Using Inverse Functions

Solving a Real – Life Problem Example 6 : The function represents the average cost c (in dollars) of making m models using a 3-D printer. Find how many models must be printed for the average cost per model to fall to $90. The average cost per model falls to $90 after 25 have been printed.

Monitoring Progress Solve each equation and check your solution(s). 1)2) 3)4) 5)6)

Monitoring Progress