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The question is on sets not solving for a straight line, the info on A is in one circle and B in the other circle, X is the intersection between both circles and i still don't have the working, even though i know the ans is 9 i need the working to be sure i did it correctly.

  • Math -

    Dr WLS gave you the answer but I will elaborate:

    The answer is in both set A and in set B since it is the intersection.
    Therefore the question is: Where is 3x-4 also 2x+5.
    To find out for what x this is true, set them equal.
    3x-2x = 5+4
    x = 9

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