book Maths Puzzle Numerical Ability

{x^2-3}=2x graphing to verify your solution

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i am having trouble with a problem where i have to find the equation of a line. the problem read...
consider two different nonvertical lines.
L1: A1x + B1y = C1 and L2: A2x + B 100 cubic inches is how many cubic feet? Can you please show me step by step how you get your answer?

Thanks, Nicole