3.2.7 Lines on a plane
Condition: Given are the equations of parallel lines \( 4 x-7 y-65=0 \) and \( 4 x-7 y-87=0 \). Find the distance between the lines and the equation of the line symmetrical to the first line with respect to the second.
Equation of a straight line on a plane. Finding the equations of heights, bisectors and medians of a triangle, the intersection of lines.