exam Maths Puzzle Numerical Ability

Hi. I need help solving this problem for my physics class. I am a bit rusty on solving systems.

I need to solve for x and y.

47-x=17y
23y+81=-3x

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exam Other Question
can u please help me with this storyproblem

during the first 10 minutes of flight, a jet plane climbs from ground level to an altitude of about 25000feet. what is the jet planes suppose f(x)=2x+5 and g(x)= -1/3x +2. Find each value.

1) f(1) over g(3) or f(1)/g(3)

????