Help me figure this question step by step. Please

Kapil needed to buy a long wooden beam. he went to two sawmills that each charge an initial fee plus an additional fee for each meter of wood. the following equation gives the price (in dollars) of a wooden beam from the first sawmill as a function of its length (in meters). p = 5+20xp=5+20x

Which is the equation of a line perpendicular to the line with the equation 3x+4y=8

Describe the relationship between the angles of similar triangles and the sides of similar triangles