NEED HELP ASAP ON ALL OF #3 AND #4

Question 101 points)which equation in slope-intercept form represents the line that passes through (5, 1) and(-4,7)

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

Christina can paint 420 square feet in 105 minutes. which unit rate describes the scenario?