Lesson solving two step equations when -x = #
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This document provides instructions for solving two-step equations. It outlines the six key steps: 1) divide the equation with an equal sign, 2) undo addition/subtraction to isolate the variable, 3) simplify, 4) undo multiplication, 5) simplify to solve for the variable, and 6) always check the answer by substituting it back into the original equation. It then provides five practice problems for students to solve.
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Lesson solving two step equations when -x = #
- 1. SOLVING TWO-STEP EQUATIONS Focus: When – x = #
- 2. LET’S REVIEW THE STEPS … 5 – x = 9 Step 1: Draw a line down the middle of the equation through the equal sign to divide the equation into 2 equal sides. 5 – x = 9 This is to remind us that whatever we do to one side, we must also do to the other. Keep it balanced!
- 3. LET’S REVIEW THE STEPS … Step 2: Undo addition and subtraction (by adding the opposite) to zero out the number on the side with the variable. 5 – x = 9 Step 3: Simplify -5 -5 and bring down – x = 4 remaining terms –1∙ x = 4 Be careful not to drop the sign in front of x.
- 4. LET’S REVIEW THE STEPS … Step 4: Now undo multiplication by dividing by –1. – 1 x = 4 – 1 –1 Step 5: Simplify x = – 4 Your answer is x = – 4 ***And now, for the most important step …
- 5. ALWAYS CHECK YOUR ANSWER …. Step 6: 5 – x = 9 5 – (-4) = 9 Substitute your 5 + 4 = 9 answer in for x 9 = 9 √ and simplify.
- 6. NOW TRY THESE … Solve the following Two-Step Equations and message your answers to Mrs. Brinson. 1. 7 – x = 5 2. -2 – x = 4 3. -x + 9 = 11 4. 18 – x = -2 5. -3 – x = -7