Szukania prosta ab =(x=0, 4) znajdź równanie prostej ab i sprawdź czy punkt c należy do tej prostej a(-1, 3) , b(2,-4) , c(-5, 7)
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AB: y-3 =(-4-3 )/( 2+1) *(x+1)
y-3 = -7/3 (x+1)
y = -7/3x -7/3 + 3
y = - 7/3x +2/3 C(-5; 7)
7 = -7/3*(-5)+2/3
7 = 35/3 +2/3
7 ≠ 37/3 C∉ AB