Hi,

m1 = 4    Consider y = 4x  Green line (m1 = 4 )

m2 = 0.25  consider y =   Blue line (m2 = (1/4)

           consider  y =  Purple line 

Note: Purple perpendicular to Green (m=4)

If lines are perpendicular, their product = to 

Note:  



 

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