Comparing with a1x+b1y+c1=0
a2x+b2y+c2=0
a3x+b3y+c3=0
Solving 2 and 3
Therefore pt. Of intersection of 2 and 3 is
Here a1=5, b1=-3, c1=1, a2=2, b2=3, c2=23, a3=42, b3=21, c3=257.
X=3×257-257×2/2×21-42×3 =771-483/42-126=288/-84=72/-21
Y=23×42-257×2/2×21-42×3=966-514/42-126=452/-84=113/-21
(x,y) =72/-21 ,113/-21
Therefore minus cancel out
So , (72/21 , 113/21)
Written on Dec. 24, 2018, 3:32 p.m.