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m1=3/4:1=3/4
m2= -4/3
melalui titik (4,1)
y-y1 = m2(x-x1)
y-1 = -4/3(x-4)
dipindah
3(y-1) = -4(x-4)
3y-3 = -4x+16
3y+4x-3-16=0
1) 3y+4x-19 = 0
2) 3y+4x = 19
3) disamakan : 3
y = -4/3+19/3