exam Maths Puzzle Numerical Ability

solve by graphing
x-2y = 8
3x - 2y = 12

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exam Other Question

How do I get the answer for Q=LvM and Q=LfM if one is melting 500g of 0c and the other is 500g of 100c water into steam Find

(c - 5)(c - 7)

(3y - 4)(2y^2 + y - 1)

Help.