Solution: Find the equation of the line through point (3, 1) and is perpendicular to the line x+5y+5=0

Solution: What is the equation of the line that passes thru (4, 0) and is parallel to the line x–y–2=0?

Solution: A line through (-5, 2) and (1, -4) is perpendicular to the line through (x, -7) and (8, 7).

Solution: If the points (-2, 3), (x, y) and (-3, 5) lie on a straight line, then what is the equation of the line?