exam Maths Puzzle Numerical Ability

How do you solve this problem by using elimination? 2x-y=-1
3x+2y=30

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exam Other Question

4x+9x-6x=42 what does x equal and show work. thank you Dividing Polynomials: synthetic

3x^4 - 8x^2 + 7 divided by x - 2

please help me if you can