High School Maths Examples and Questions

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Questions − Simultaneous Equations by Substitution

1.  Solve these equations by substitution

   6x + y = 30
   5x − y = 14

2.  Solve these equations by substitution

   5a + 2b = 54
   4a + b = 36

3.  Solve these equations by substitution

   8x + 3y = 47
   3x − y = 24

4.  Solve these equations by substitution

   9x + y = 50
   7x − y = 78

5.  Solve these equations by substitution

   5a + 3b = 18
   4a − 5b = 44

6.  Solve these equations by substitution

   7x + y = 67
   5x + y = 45

7.  Solve these equations by substitution

   11x + y = 90
   8x + 7y = 78

8.  Solve these equations by substitution

   12x + 4y = 84
   7x + 2y = 56




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