Solving Two Step Equations

What is the first step in this equation?

3x + 5 = 20

• Add 5 and 20

• Subtract 5 from both sides of the equation

• Add 3 and 5

• Multiply 3 by 5

After you subtract 5 from both sides of the equation 3x + 5 = 20, what will the equation look like?

• 3x = 25

• 3x = 20

• 3x = 3

• 3x = 15

What is the next step in the equation?

3x = 15

• Divide both sides by 3

• Add 3 and 15

• Subtract 3 and 15

• Multiply 3 and 15

What is the final answer?

• 45

• 18

• 5

• 12

6 - 3a = 21

• a= 9
• a= -9
• a= -5
• a= 5

-3a + 8 = 14

• a= -2
• a= -7.5
• a= 2
• a= 6

7 + ^a⁄₃ = 5

• a= -2
• a= -6
• a= 3
• a= 15

50 = 28.1 + 0.15a

• a= 150
• a= 146
• a= 6
• a= 155

To Solve a Simple Two-Step Equation you need to ...

• Undo the Addition/Subtraction first (to remove the constant term), then undo the Multiplication /Division (to remove the coefficient and isolate the variable)

• Undo the Multiplication/Division first (to remove the coefficient and isolate the variable), then undo the Addition/Subtraction (to remove the constant term)

• Multiply both sides by 1

• Substitue zero for the variable (to remove the variable and isolate the constant

To "get rid" of a fraction in an equation you need to multiply by...

• The Numerator

• The Denominator

• The Reciprocal

• Zero