Indicate the equation of the line that is the perpendicular bisector of the segment with endpoints (4, 1) and (2, -5). fill in the blank i have no idea how i'd solve this, also some pointers would be nice for future references if you don't mind. : )

Eric has challenged himself to walk 24,000 steps in 4 days. if eric walks the same number of steps each day, which function represents the number of steps eric still needs to walk to reach his goal with respect to the number of days since he started his challenge? a. y = 8,000x − 24,000 b. y = -8,000x + 24,000 c. y = 6,000x − 24,000 d. y = -6,000x + 24,000