exam Maths Puzzle Numerical Ability

Simplify: no negative exponents or decimal answers
x^-2-y^-2/x^-1-y^-1

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exam Other Question

Solve the system by graphing.
x - y = 5
x + y = 3

What I really need help with is what are the plot points? x=(5,0) y=(0,3)? i need help on what says: 3x-2