exam Maths Puzzle Numerical Ability

x/4 - y/11 = -9/44

x/6 - y/13 = -1/26

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exam Other Question

i do not understand linear graphs Factor. 3x(x + 2y) + 7(x + 2y) im not sure how far I can take this.
I have 3x^2+6xy+7x+14y am i right or do I need to go more?