It is known that two straight lines L1: MX + Y - (M + 1) = 0 and L2: x + my-2m = 0. When the value of real number m is taken, the relationship between L1 and L2 is as follows: (1) intersection; (2) coincidence; (3) perpendicularity | Math enthusiast | Mathematical art

It is known that two straight lines L1: MX + Y - (M + 1) = 0 and L2: x + my-2m = 0. When the value of real number m is taken, the relationship between L1 and L2 is as follows: (1) intersection; (2) coincidence; (3) perpendicularity

According to the meaning of the question: when the slope of L2 does not exist, that is, when m = 0, L1: y = 1L2: x = 0, two straight lines intersect vertically (1) (i.e. the slope is not equal); when m ≠ 0, m ≠ 1 / M (the slope is not equal); when m ≠± 1, two straight lines intersect

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