exam Maths Puzzle Numerical Ability

solve using the addition method.

2x - 3y = -6
x + y = 7

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exam Other Question

Sketch the graph of a system with the following: x+2y<160, 3x+y<180, x>0, y>0. Help me!
1) Express x�- 1/(x+2)(x-2) as partial fractions.
2) Find the solutin set of 2/x-3>5/x-1