exam Maths Puzzle Numerical Ability

Solve Each Problem.

A food chemist tests enzymes for their ability to break down pectin in fruit juices. Excess pectin makes juice cloudy. In one test, the chemist measures the

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im having a difficult time solving this kind of problem

5x-2y=4
x+2y=8

it says to solve each equation by the addition menthod (*you may have to multiply both sides by -1)

if you can show me the steps and explain them to me thanks.
I am looking for someone who can help with statistics???

Anyone? I used this site for Algebra and it was so fantastic. I really need help with Stats.