exam Maths Puzzle Numerical Ability

solve the following of linear equation by elimination, i.e. solve for x and y, and explain the meaning of the answer:
3x+4y=-3
-6x-8y=6

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exam Other Question

What is the square root of y+12=5? (the square root sign is over y+12) two numbers are happy twins if they are consecutive happy numbers. find a pair of happy twin numbers. there is a pair that is less then a 100.