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Persamaan garis yg sejajar garis ax + by + c = 0 dan melalui (x1 , y1) :ax + by = ax1 + by1
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Persamaan garis yg sejajar garis 3y - x/4 + 1 = 0 dan melalui (-2,4) :
ax + by = ax1 + by1
-x/4 + 3y = -1/4 . (-2) + 3(4)
-x/4 + 3y = 1/2 + 12
Kdua ruas ( ×4 )
-x + 12y = 50
Opsi : A
m=1/12
y-y1=m(x-x1)
y-4=1/12(x-(-2))
y-4=x/12+1/6
x/12-y+1/6+4=0
x/12-y+25/6=0 (kedua ruas dikali 12)
x-12y+50=0