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Using substitution method to solve systems of equations

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Intros
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Lessons
    • What is a system of equations?
    • What does it mean by "solving system of equations by substitution"?
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Examples
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Lessons
  1. Solve each linear system algebraically by substitution
    1. 6x - 1y = 7
      -9x + 2y = 7
    2. 3(x+2) - (y+7) = 4
      5(x+1) + 4(y+3) = 31
    3. x+12+y−214=3 {{x+1} \over 2} + {{y-2} \over 14} = 3
      x−224−y+12=−114 {{x-2} \over 24} - {{y+1} \over2} = -{11 \over 4}
    4. x - y = - 1

      3x + 5y = 21