Solve Eq Notes 02
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Solve Eq Notes 02

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Solve Eq Notes 02 Solve Eq Notes 02 Presentation Transcript

  • Solving Equations Using  Addition and Subtraction 1
  • To Solve an Equation means... • To isolate the variable on  one side of the equation. • Ex: x = 5 is solved for x. • y = 2x ­ 1 is solved for y. 2
  • Addition Property of Equality if a = b, then a + c = b + c. What it means: You can add any number to BOTH sides of an  equation and the equation will still hold true. 3
  • An easy example: We all know that 7 = 7. Does 7 + 4 = 7?  NO! But 7 + 4 = 7 + 4. The equation is still  true if we add 4  to both sides. 4
  • Let’s try another example! x ­ 6 = 10 Check 5
  • What if we see  y + (­4) = 9 Check  6
  • How about  ­16 + z = 7 Check   7
  • A trick question... ­n ­ 10 = 5 Check  8
  • Subtraction Property of Equality if a = b, then a - c = b - c. What it means: You can subtract any number from BOTH sides of an  equation and the equation will still hold true. 9
  • 3 Examples: 1) x + 3 = 17 3) z ­ (­5) = ­13 2) 13 + y = 20      10
  • 11
  • Try these on your own... 12
  • The answers... 13
  • 14