Problem 16
For now, let's just focus on the x coordinates of each point.
Consider a number line that has -4 and 0 on it. The midpoint is found by adding those values, and dividing the sum by 2
(-4+0)/2 = -4/2 = -2
The value -2 is right in the middle of -4 and 0. So -2 is the x coordinate of the midpoint
For the y coordinate of the midpoint, we do the same idea for the y coordinates of each given point: add them up, divide by 2.
(7+(-3))/2 = (7-3)/2 = 4/2 = 2
The y coordinate of the midpoint is y = 2
Answer: The midpoint is (-2, 2)
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Problem 18
This problem is going to follow the same exact steps as problem 16, but the numbers are different of course.
x coord of midpoint = (-8+(-4))/2 = -12/2 = -6
y coord of midpoint = (-6+10)/2 = 4/2 = 2
Answer: The midpoint is (-6, 2)