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garis melalui (2,6) dan (-1,-4)
maka
m = (6+4) / (2+1) = 10/3
y+4=10/3 (x+1)
3(y+4) = 10(x+1)
3y+12 = 10x+10
10x-3y-2 = 0
b.
garis melalui titik (1,3) dan (8,-5)
maka
m = (3+5) / (1-8) = -8/7
y-3 = -8/7 (x-1)
7(y-3) = -8(x-1)
7y-21 = -8x+8
8x+7y-29 = 0
Penetapan titik ke-1 dan titik ke-2 bebas sesuai keinginan.
a.)
Melalui (-1,-4) dan (2,6)
b.)
Melalui (1,3) dan (8,-5)