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4x+3y=12
ax+by=c
m= -a/b
m= -4/3
m1.m2 = -1
-4/3.m2 = -1
m2 = 3/4
persamaan y melaluo titik (8,-4)
y-y1=m(x-x1)
y-(-4)=3/4(x-8)
y+4 = 3/4x-6
y = 3/4x -10