exam Maths Puzzle Numerical Ability

Solve the systemby addition or substitution.
3x -4y =8
6x -2y =10

This is the answer I got:
9x-6y =18

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exam Other Question

sqrt 72 * sqrt 48 Find the probability that 2 friends never agree on two seperate topics out of 100. The probability that they agree on any given topic is 0.02, and ifthey did agree they would consider it a coincidence, and any two topics are independent events.