Does anyone know the answers to this?

Plz heeeeeeelp plz give me the answer

Find an equation of the line perpendicular to the graph of 28x-7y=9 that passes through the point at (4,1)

Thales was an ancient philosopher familiar with similar triangles. one story about him says that he found the height of a pyramid by measuring its shadow and his own shadow at the same time. if the person is 5-ft tall, what is the height of the pyramid in the drawing?