Solving Equations

The objective when solving an equation is to....

• isolate the variable.
• check the solution.
• guess and check.
• Combine Like Terms.

What does 3x mean?

• A. Three times X
• B. Three divided by X
• C. Three and X

Which operation will cancel out multiplication?

• A.  Addition
• B. Subtraction
• C. Multiplication
• D. Division

Translate: 
Four times a number plus six is 30.

• 4 + 6 = 30
• 4x + 6 = 30
• x + 4 times 6 = 30
• 30 = 4x

Translate the sentence into an equation:
Four more than six times a number is 18.

• 10x = 18
• 4x + 6 = 18
• 4 + 6x = 18
• not enough info

Write an equation. 
Three times a number plus five is 40. 

• 3x + 5 = 40
• 3x - 5 = 40
• 3x + 5x = 40
• 3x - 5x = 40

Twelve decreased by twice a number is -7.  Find the number.
True or False:  The equation produced by this statement is 2n - 12 = -7 

• True
• False

What is the best first step in solving this equation:
6 = -12 + h/(-7)

• Add 12 to each side
• Subtract 12 from each side
• Multiply by 7 on each side
• Divide by -7 on each side

Write an equation.
A number is doubled, then 9 is added. The result is 23.

• 2x + 9 = 23
• 2x - 9 = 23
• 2x + 9x = 23
  2x + 9x =23
• 9 - 2x = 23

Solve:
-4x = 24

• 20
• -20
• 6
• -6