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Compulsory Lines and Equations of Mathematics in People's Education Press
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Solution: The straight line L passes through point A(x0, y0). According to the point inclination equation of the straight line, let the equation of the straight line L be y-y0=k(x-x0). Because it is perpendicular to the straight line Ax+By+c=0, the product of the slopes of the two straight lines is-1, that is, k *(a/b)= 1

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