exam Maths Puzzle Numerical Ability

PLEASE SOLVE THE FOLLOWING EQUATION WHERE X&Y ARE REAL :
Xi/1-yi=3x-yi/3x+4y

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exam Other Question

Please help me solve the problem below by addition, substituting and graphing...

4x - 6y = 12
2x + 2y = 6

Thank you for your help -4x -2y =10