exam Maths Puzzle Numerical Ability

2x+y=16
3x-y=4
I need to solve for x and y

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exam Other Question

This has me so confused. Can somone help me.

The combined resistance of two resistors R1 and R2 in a parallel circuit is given by the formula R=1/(1/R1+1/R2)
Simplify the formula. if f(x) =5x-1 find the following.
f(a-2)