Question

if a line is equally enclined to the axis,prove 5hat it's slope is ±1
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Answer 1

Answer: By the meaning of equally inclined lines, we mean that the lines which make equal angles with both the co-ordinate axes. The above diagram shows that PQ and RS are the two equally inclined lines. Therefore, slope = tan 45° = 1. Therefore, slope = tan (-45°) = -1.