Solving TwoStep Equations Teacher Jimmy Frost What is

Solving Two-Step Equations Teacher: Jimmy Frost

What is a Two-Step Equation? An equation written in the form Ax + B = C

Examples of Two-Step Equations a) 3 x – 5 = 16 b) y/4 + 3 = 12 c) 5 n + 4 = 6 d) n/2 – 6 = 4

Steps for Solving Two-Step Equations 1. Solve for any Addition or Subtraction on the variable side of equation by “undoing” the operation from both sides of the equation. 2. Solve any Multiplication or Division from variable side of equation by “undoing” the operation from both sides of the equation.

Opposite Operations Addition Subtraction Multiplication Division

Helpful Hints? ü Identify what operations are on the variable side. (Add, Sub, Mult, Div) ü “Undo” the operation by using opposite operations. ü Whatever you do to one side, you must do to the other side to keep equation balanced.

Ex. 1: Solve 4 x – 5 = 11 4 x – 5 = +5 4 x = 4 x=5 15 +5 (Add 5 to both sides) 20 (Simplify) 4 (Divide both sides by 4) (Simplify)

Let’s Try These Examples 1. 2 x – 5 = 17 2. 3 y + 7 = 25 3. 5 n – 2 = 38 4. 12 b + 4 = 28

Check our answers!!! 1. x = 11 2. y = 6 3. n = 8 4. b = 2

Ready to Move on?

Ex. 2: Solve x/3 + 4 = 9 -4 -4 x/3 = 5 (Subt. 4 from both sides) (Simplify) (x/3) 3 = 5 3 (Mult. by 3 on both sides) x = 15 (Simplify)

Try these examples! 1. x/5 – 3 = 8 2. c/7 + 4 = 9 3. r/3 – 6 = 2 4. d/9 + 4 = 5

Check your answers!!! 1. x = 55 2. c = 35 3. r = 24 4. d = 9