3.2 Solving Equations by Multiplying and Dividing

ESSENTIAL QUESTION: How can we create and solve equations that must be solved my multiplying or dividing and use them in the real world?

BELLRINGER

Solve the following equations.Use your Unit III folder for a reference.

3x = 18 x = 20x = 2

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Solving Equations by Division (Apply to Real World)

Alicia is a carpenter. She has to buy 8 - foot long boards to complete the framing of a house. In order to compare costs, she needs to know the cost per foot (1 foot). At one store she finds her 8 - foot boards for $2.40 each. She needs to find out how much the board cost per foot (1 foot)?

KnownsUnkowns

Define the Variable

Write Equation and Solve

You try...

You are a carpenter and your boss sends you to purchase some lumber for a job. The first store you go to sells 10 foot boards for $3.70 each. How can you find out how much it costs per foot (1 foot)?

KnownsUnkowns

Define Variable

Write Equation and Solve

Solving Equations by Division (Computation)

1.) 5x = 50 2.) 4x = 36 3.) 6x = 36 4.) 9x = 45

Solving Equations by Multiplication (Computation)

1.) x = 4 2.) x = 6 3.) x = 3

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Solving Equations (Real World Applications)

Max is an apprentice carpenter. He has to consider the cost of buying masking tape for a project.

If one roll of masking tape costs $1.15, how many rolls can Max buy with $5.75?

KnownsUnkowns

Define the Variable

Write Equation and Solve

EXIT TICKET

Solve the following equations.Check your answer appropriately.

1.) 11x = 77 2.) x = 12 4

Shane has to buy tape for his work, if one roll or tape costs $1.34. How many rolls of tape can he buy for $10.72?

Define the Variable

Write the Equation and Solve