Can u please help me

Inez has a phone card. the graph shows the number of minutes that remain on her phone card a certain number of days.

Find the magnitude, correct to two decimal places, made by each of the following with positive direction of the x axis a) y= x the answer is 45° but i don’t know how

Determine if the outside temperature is a function of the time of day or if the time of day is a function of temperature and explain why or why not.