Find slope and y intercept form table

Ineed to know the answer to this algebra question.

The pyramid below was dissected by a horizontal plane which shape describes the pyramid horizontal cross section

Johnny rode his bike to a friends house 4 blocks down the street in his neighborhood. he immediately rode back home once he realized his friend was unable to play. what was his displacement for the total bike ride trip? what could you use as a reference point ? show the steps to solve this problem.