Please answer part a and b thank you!! and don't forget to show proof

Step-by-step explanation:

First part

y-intercept of the line means where the line crosses the y-axis

Here we can see that the line crosses the y-axis at 4 so the y-intercept is 4 hence (0 , 4) is the point.

Second part

The point (0 ,4) represents 0 hours after sunrise the temperature is 4°C(degree Celsius) which means when the sun has not risen the temperature is 4 degrees