| 1) | 12x -4y + 9 x + 9y | 2) | 12x -7y + 10 x + 8y |
| 3) | 11x -9y + 5 x + 4y | 4) | 12x -10y + 4 x + 6y |
| 5) | 12x -5y + 4 x + 2y | 6) | 8x -10y - x + 5y |
| 7) | 10x -4y + 5 x + 9y | 8) | 5x -6y -2 x + 3y |
| 9) | 7x -5y + 9 x + 9y | 10) | 9x -9y -3 x + 5y |
| 11) | 12x -6y -4 x + 4y | 12) | 10x -8y + 10 x + 8y |
| 13) | 4x -8y + 12 x + 6y | 14) | 3x -4y + 4 x + 4y |
| 15) | 6x -5y -4 x + 5y | 16) | 3x -7y + 11 x + 8y |
| 17) | 9x -9y -2 x + 4y | 18) | 10x -10y - x + 3y |
| 19) | 9x -6y -6 x + 8y | 20) | 10x -7y -4 x + 4y |
| 21) | 4x -6y + 10 x + 8y | 22) | 8x -10y -2 x + 2y |
| 23) | 4x -7y -2 x + 5y | 24) | 7x -4y - x + 3y |
| 25) | 11x -8y -2 x + 7y | 26) | 12x -7y -6 x + 8y |
| 27) | 2x -10y + 2 x + 6y | 28) | 5x -5y + 5 x + 4y |
| 29) | 9x -4y + 8 x + 5y | 30) | 7x -9y + 8 x + 8y |
| 31) | 3x -8y + 9 x + 9y | 32) | 11x -6y + 2 x + 8y |
| 33) | 3x -5y -3 x + 9y | 34) | 4x -9y + 5 x + 9y |
| 35) | 6x -6y -4 x + 6y | 36) | 12x -8y + 10 x + 6y |
| 37) | 7x -9y -6 x + 5y | 38) | 2x -5y + 12 x + 5y |
| 39) | 2x -7y + 3 x + 7y | 40) | 8x -5y + 2 x + 6y |
Joke:
What is the best excuse for not doing your maths homework? - Pythagoras' birthday!