Using section formula show that the
Points A(7,-5),B(9,-3)and C(13,1) are collinear
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1/2[7(-3-1) +9(1+5) +13(-5+3) ]
1/2[7×-4+9×6+13×-2]
1/2(-28+54-26)
1/2(54-54)
0/2=0
1/2[7×-4+9×6+13×-2]
1/2(-28+54-26)
1/2(54-54)
0/2=0
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