Question: Recall that two lines y = mx + b and y = nx + c are orthogonal provided mn = -1 (the slopes are negative

Recall that two lines y = mx + b and y = nx + c are orthogonal provided mn = -1 (the slopes are negative reciprocals of each other). Prove that the condition mn = -1 is equivalent to the orthogonality condition u • v = 0, where u points in the direction of one line and v points in the direction of the other line.

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