I neeed help with this pls

The lines shown below are parallel. if the green line has a slope of -1, what is the slope of the red line?

Last year, a state university received 3,560 applications from boys. of those applications, 35 percent were from boys who lived in other states. part a)how many applications did the university receive from boys who lived in other states? part b)applications to the university from boys represented 40percent of all applications. how many applications did the university receive in all? i don't how to do part b so me and plz tell how you got your answer

Which point is a solution to y s 4x + 5?