3.2.8 Lines on a plane

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