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Two lines

Let A and B be two straight lines such that the gradient of A is the y-intercept of B and the y-intercept of A is the gradient of B (the gradient and y-intercept of A are not the same). What are the co-ordinates of the point where the lines meet?

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If you enjoyed this puzzle, check out Sunday Afternoon Maths V,
puzzles about coordinates, or a random puzzle.

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