2) Find the equation of the straight line passing through the point ( 1 , 2 ) and
perpendicular on the straight line passing through the two points
A( ?? , -?? ) , ??(?? , -??)
M1 = -??+ ?? = -??
??-?? ??
Y= -?? X+C
??
2 = -?? x1+C
??
C = ??
??
The equation Y = -?? X + ??
?? ??
3-
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