SOL 7.14: Solving Multiplication Equations
Review:
Use the following to answer the questions:
6x + 5 – 3y = 12
1) Is it an equation, expression or an inequality? ___________________
How do you know? ________________________________________
2) Identify the term(s): _______________________________________
3) Identify the variable(s): _____________________________________
4) Identify the constant(s): ____________________________________
5) Identify the coefficient(s): ___________________________________
Review:
Equations must be in ______________________, like a scale.
How would you solve this equation?
x – 4 = 12
Use the _______________ operation to undo the _______________.
Division Property of Equality: If you ____________ each side of an equation
by the same ______________ number, the two sides remain __________.
1. 2x = -8 ● What is the coefficient in this equation? _____
● What is the opposite(inverse) of multiplying by 2? __________
● Use the division property of equality:
________ both sides of the equation by ____.
● x = _____
Check: 2x = -8
Replace the ___________________ with the ________________.
2( ) = -8
2. -5m = 40
● What is the coefficient in this equation? _____
● What is the opposite(inverse) of multiplying by -5? ________
● ________ both sides of the equation by ____.
● m = _____
Check: -5m = 40
-5( ) = 40
3. 30 = 6n ● What is the coefficient in this equation? _____
● What is the opposite(inverse) of multiplying by 6? __________
● ________ both sides of the equation by ____.
● n = _____
Check: 30 = 6n
30 = 6( )
4. 1.2x = -4.8
● What is the coefficient in this equation? _____
● What is the opposite(inverse) of multiplying by 1.2? _____
● ________ both sides of the equation by ____.
● x = _____
Check: 1.2x = -4.8
1.2( ) = -4.8
5. -3y = 2
● y = _____
Check: -3y = 2
-3( ) = 2
Using an equation to solve a problem.
1. Sarah earns $5 dollars per hour when she baby-sits. How many hours does
she need to work to earn $75?
Write an equation:
Solve the equation:
Sarah must work _________________ hours to earn $75.00.
2. A 125 pound person uses 4.4 calories per minute when walking. How many
minutes will it take this person to use 44 calories?
Write an equation:
Solve the equation:
A 125 pound person must walk for _________________ to use 44
calories.