Whats 409 divided by 2 also I need some anime pics ty

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

Asap! i'm not good math and i'm lost.

Atourist boat is used for sightseeing in a nearby river. the boat travels 2.4 miles downstream and in the same amount of time, it travels 1.8 miles upstream. if the boat travels at an average speed of 21 miles per hour in the still water, find the current of the river.