16. What does the point of intersection of the two lines, y = -x + 2; y = x + 4?
17. Find the intersection point of the following lines: y = x+3; y = 12-2x.
18. Find the intersection point of 2x+y-8=0 and 4x-3y=6.
19. Find the equation of the line through (3,1) and parallel to the line with equation2x - y = 4.
20. Find the equation of the line perpendicular to AB where A =(1,5) and B =(3,-8) and passing through the midpoint of AB.