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AB: y= ax +b
0= -6a +b
1= a+b /· (-1)
0= -6a +b
-1=-a -b dodajemy stronami
-1= -7a /: (-7)
a= 1/7
1= 1/7 +b /-1/7
6/7 =b y= 1/7x +6/7 - prosta AB
BC: 1= a+b /·(-1)
4= -3a +b
-1 =-a -b
4=-3a +b dodajemy stronami
3= -4a/ :(-4)
a= -3/4
1= -3/4 +b
b=1+3/4
b= 7/4 y= -3/4x +7/4 - prosta BC
AC: 0 = -6a +b /·(-1)
4 = -3a +b
0 =6a -b
4= -3a +b dodajemy stronami
4= 3a /:3
a= 4/3
0= -6·4/3 +b
0 = -8 +b
8=b y= 4/3x +8 - prosta AC
Prosta AC jest prostopadła do BC, bo 4/3 ·(-3/4)= -1
Trójkąt ABC jest trójkątem prostokątnym.