exam Maths Puzzle Numerical Ability

please help me with this algebra problem (use linear combinations to solve the system of linear equations)x-y=0 -3x-y=2

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exam Other Question

sqrt 50x^3 divided by 81y^8 Find a rational zero of the polynomial function and use it to find all the zeros of the function.

f(x) = x to the third power + 4x to the second - x - 4