Is the equation y = 0.75x a proportional relationship?

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

8litres of paint can cover 129.6 m². how much paint is required to paint an area of 243m²?

Ineed with the quizzes in apex mathematics ii