exam Maths Puzzle Numerical Ability

Solve by elimination:

2x+3y=21
5x-2y=-14

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exam Other Question

Im trying to combine like terms

(2x squared -x+3) + (x squared +3x+4) If 10 pens and 15 markers cost $26, and 5 of the same pens and 10 of the same markers cost $16, find the cost of a pen.