Get on mathpapa is shows you the answer and how to explain it
Answer:
(-1, -2.5)
Step-by-step explanation:
the midpoint of a segment is 
, given points (x1, y1) and (x2, y2)

19. -x-2 = 2/3x + 3
5/3 x + 3 = -2
5/3x = -5
x = -3
20. none are correct, you can double check me by plugging in the x and y values in the coordanates into the first problem none of them worked out in the first equasion so no need to test the second
21. -3 is the answer, capable of being done by using desmos
(1) -(5y - 2)= -5y+2
(2) -5 (3n + 1)= -15n - 5
(3) too long to do