Determine in two ways whether or not the points A (-1,-1), B(4,1) and C(12, 4) lie on a straight line. Is AB + BC = AC? Is area ABC zero ?
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Expert's answer
2011-11-18T08:15:55-0500
If they lie on line then Y=kx+b -1=-k+b 1=4k+b 4=12k+b b=k-1 1=4k+k-1=5k-1 k=2/5 b=-3/5 4=12*2/5-3/5=21/5, is not a line, so AB + BC is not equal to& AC area ABC is for sure more then 0
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