Find the measurements of each angle

The table respent two linear functions the equation respented by the first tables is given

What is best way to getting answer for my exam is

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.