exam Maths Puzzle Numerical Ability

Simplify the expression. Write answer with positive exponents. Assume that all variabls reperesent positive real numbers. -25^-2/3

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exam Other Question

I have to eliminate using multiplication. How would I solve these two problems?

2x+3y=6
x+2y=5

4x+5y=6
6x-7y=-20
2x+y=5
3x-y=3