exam Maths Puzzle Numerical Ability

solve the system by addition 2x + 4y = 3
4x -2y =1

Thank you in advance

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exam Other Question

hey i got stuck halfway through this one:

5/6ab-7/8a

this is what i got:

i found the Least Common Denominator=24ab
multiplied it out to get

20-21b/24ab and im not sure how to simplify from here. Whattya think? how can u find a slop of a linon the graph