exam Maths Puzzle Numerical Ability

5+y= 14
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y-3 10

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exam Other Question

I would like to know how can i compute the query that listed in the exercise 4.4 1 in the text book with the above ISBN. Can someone explain how I am supposed to solve by substitution with the problems x-y=5 x+2y=7 and 3b+2a=2 -2b+2a=8