Please help me with this 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

What is the x-intercept and y-intercept of the equation 2x+1. 2o

The two square pyramids are similar. find the total volume of both pyramids if the ratio of their surface areas is 9/16