What is the constant of proportionality between y and x in the graph

Landon wrote that 3−2.6=4. which statement about his answer is true?

Answer! if you don’t mind, can you explain

Iwill give brainliest. suppose tommy walks from his home at (0, 0) to the mall at (0, 5), and then walks to a movie theater at (6, 5). after leaving the theater tommy walks to the store at (6, 0) before returning home. if each grid square represents one block, how many blocks does he walk?