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Two straight lines are parallel and vertical. There is a formula, what is vertical equal to 0? Parallel equals-1? Forgot, high school math
Yes, it's a vector.
The formula of the vertical vector b of 1. vector a* vector B = (x 1 * x2, y1* y2) = x1* x2+y1* y2 = 0.
2. Vector a∑ Vector B, a(x 1, y 1), b(x2, y2), Vector a∑ Vector B is y 1/x 1 = y2/x2, and the slope is equal to 65438+.