The two lines -x +my +3 =0 and 2x + y +3 = 0 are perpendicular. What is the value of M? I was away for this lesson and I don't know how to do this. Thank you for helping me
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Hiya Gideonrichter, Perpendicularity requires that one gradient is the negative reciprocal of the other. (m = -1/m) Rearrange the equations to get the following: y= x/m -3/m y= -2x -3 the gradients are: 1/m and -2, therefore m=2
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