Grade 9

1. 3x + 21 = 5y
   4y + 6 = - 9x
   
2. 8x - 3y = 22
   6x + 12y = -12
   
3. m - 3n = 11
   2m = -10n + 6
   
4. 6x = 12 - 3y
   y - 2x = -16
   
5. 2a - 3b = 13
   5a - b = 13
   
6. y = 3x - 5
   y = 4x + 6
   
7. 3a = 2b - 10
   b + 15 = 3a
   
8. y = 4x - 3
   Y = 4x - 7
   
9. y = 5x - 3/2
   y = 5x - 1.5
   
10. 2x + y = 3
    3x + 2y = 5
    
    Solution 1. x = 198/19, y = -69/19 2. x = 2 y = -2, 3. m = 8 n = -1, 4. x = 5 y = -6, 5. a = 2 b = -3 6. x = -11, y = -38, 7. a =40/3 , b = 25, 8. no solutions 9. an infinity of solutions, 10. x = 1 y = 0