Flow Chart Question of the Day A seamstress charges $35 per hour plus an initial consulting fee of $25. The seamstress charged one client a total of $305.

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Presentation transcript:

Flow Chart Question of the Day A seamstress charges $35 per hour plus an initial consulting fee of $25. The seamstress charged one client a total of $305. Write an equation that can be used to solve for h, the number of hours the seamstress worked on this project? How many hours did the seamstress work?

Solving Equations involving absolute value. Standard: M8A1c SW Solve absolute value equations. EQ: How will my understanding of absolute value justify finding two solutions?

Solving Absolute Value Equations Absolute value is denoted by the bars |3|. Absolute value represents the distance a number is from 0. Thus, it is always positive. |8| = 8 and |-8| = 8

Solving absolute value equations First, isolate the absolute value expression. Set up two equations to solve. For the first equation, drop the absolute value bars and solve the equation. For the second equation, drop the bars, negate the opposite side, and solve the equation. Always check the solutions.

6|5x + 2| = 312 Isolate the absolute value expression by dividing by 6. 6|5x + 2| = 312 |5x + 2| = 52 Set up two equations to solve. 5x + 2 = 525x + 2 = -52 5x = 50 5x = -54 x = 10orx = Check: 6|5x + 2| = 312 6|5x + 2| = 312 6|5(10)+2| = 312 6|5(-10.8)+ 2| = 312 6|52| = 312 6|-52| = = = 312

3|x + 2| -7 = 14 Isolate the absolute value expression by adding 7 and dividing by 3. 3|x + 2| -7 = 14 3|x + 2| = 21 |x + 2| = 7 Set up two equations to solve. x + 2 = 7 x + 2 = -7 x = 5 or x = -9 Check: 3|x + 2| - 7 = 14 3|x + 2| -7 = 14 3|5 + 2| - 7 = 14 3|-9+ 2| -7 = 14 3|7| - 7 = 14 3|-7| -7 = = = = = 14