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m1 x m2 = -1
4/6 x m2 = -1
m2= -1 x 6/4
m2 = -3/2
y-y1= m(x-x1)
y+3= -3/2( x- 4)
y+3 = -3/2x +6...... tiap ruas kali 2
2y+6=-3x+12
2y+6+3x-12=0
2y+3x-6=0