Can someone help with this

You will get 25 points an image of a rectangular prism is shown below: part a: a cross section of the prism is cut with a plane parallel to the base. what is the name of the shape created by the cross section? explain your answer. (5 points) part b: if a cross section of the prism is cut perpendicular to the base, what would be the shape of the resulting cross section? explain your answer. (5 points)

Really need on these. i have no idea what to do

Y= 4x + 3 y = - 1 4 x - 5 what is the best description for the lines represented by the equations?