book Maths Puzzle Numerical Ability

how do i slove a system by subtitution?..specifically this problem

y=x-2
y=2x

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book Other Question

Simplify: 4x>2+12x+xy+3y divided by x>3+27 how many liters of water must be added to 8 liters of a 40 percent acid solution to obtain a 10 percent acid solution?