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3 3two Step Equations

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3 3two Step Equations

1. 1. Two Step Equations Step One: Add or Subtract on both sides Step Two: Multiply or Divide on both sides. in-class practice items For chapter 3.3
2. 2. following steps <ul><li>Find the variable. </li></ul><ul><li>What is the operation? </li></ul><ul><li>Use the inverse operation on both sides </li></ul><ul><li>Work down. </li></ul><ul><li>r + 18 = - 7 </li></ul><ul><li>r + 18 = - 7 </li></ul><ul><li>r + 18 = - 7 </li></ul><ul><li>- 18 -18 </li></ul><ul><li>r + 0 = -25 </li></ul><ul><li>r = -25 </li></ul>
3. 3. following steps <ul><li>Find the variable . </li></ul><ul><li>What is the operation? </li></ul><ul><li>Use the inverse operation on both sides </li></ul><ul><li>Work down. </li></ul><ul><li>6.3r = - 7 </li></ul><ul><li>6.3 r = - 7 </li></ul><ul><li>6.3r = - 7 </li></ul><ul><li>6.3 6.3 </li></ul><ul><li>1r = -1.1 </li></ul><ul><li>r = -1.1 </li></ul>1
4. 4. Order of two-step equations. <ul><li>Isolate the variable that is attached by division or multiplication. </li></ul><ul><li>Use the inverse operation on both sides </li></ul><ul><li>Work down. </li></ul><ul><li>Isolate the variable. </li></ul><ul><li>7x - 5 = -54 </li></ul><ul><li>+5 +5 </li></ul><ul><li>7x + 0 = -49 </li></ul><ul><li>7x = -49 </li></ul><ul><li>7 7 </li></ul><ul><li>1 x = - 7 </li></ul><ul><li>x = - 7 </li></ul>1
5. 5. Practice the order <ul><li>5x+9=39 </li></ul><ul><li>9p+11 = -7 </li></ul><ul><li>3 + 2x = 21 </li></ul><ul><li>12 = 9x - 6 </li></ul><ul><li>-8m – 12 = 20 </li></ul><ul><li>8p + 15 = 87 </li></ul><ul><li>47 = 2f – 3 </li></ul><ul><li>16 = -5w - 9 </li></ul>
6. 6. Practice the steps <ul><li>5x+9=39 </li></ul><ul><li>-8m – 12 = 20 </li></ul>
7. 7. Practice answers <ul><li>5x+9=39 </li></ul><ul><li>-8m – 12 = 20 </li></ul>
8. 8. Practice the equations <ul><li>9p+11 = -7 </li></ul><ul><li>8p + 15 = 87 </li></ul>
9. 9. Practice answers <ul><li>9p+11 = -7 </li></ul><ul><li>8p + 15 = 87 </li></ul>
10. 10. What’s the order? Add 22, then multiply by 5 Subtract 3.2, then multiply by -5 Add 1, then multiply by 10
11. 11. Work the Steps
12. 12. Work the Steps +22 +22 -3.2 -3.2 +1 +1