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m1= y2-y1/ x2-x1 = p-2p / -1+5 =-p/4
m2=m1
-1/2=-p/4
p=2
(1,2) dan (3,1) → m2
cari m2 dl
y2-y1 /x2-x1 = 1-2 / 3-1 = -1/2. jadi m2= -1/2
cari nilai p
m= ▲y /▲x
-1/2 = y2-y1 / x2-x1
-1/2= p-2p / -1 - -5
-1/2=p-2p /-1+5
-1/2 = -p / -4
-1/2 . -4 = -p
2= -p
p= -2