3.2.8 Lines On a Plane

Condition: the coordinates of the vertices of the triangle \ (a b c \) are given. Make a drawing in the coordinate system. Find: 1) the length of the side \ (a b \); 2) equations of the parties \ (a b \) and \ (b c \). \ [A (0; 3), \ quad b (12; -6), \ quad C (10; 8) \]