exam Maths Puzzle Numerical Ability

How do you solve this equation??
5x-y=10
7x-2y=11

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exam Other Question

I need to Write an equation in the standard form for the indicated conic section of A parabola with vertex (3,1) and directrix y = -1 If a runner runs a 42.2 km course in 2.114 hours, what is his average speed?

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