Solving simultaneous equations by substitution

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Intros

Lessons

- What is a system of equations?
- What does it mean by "solving system of equations by substitution"?

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Examples

Lessons

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. ${{x+1} \over 2} + {{y-2} \over 14} = 3$
  ${{x-2} \over 24} - {{y+1} \over2} = -{11 \over 4}$
4. x - y = - 1
  
  3x + 5y = 21

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