Question 905684
The midpoint of qr is (1,-2) one endpoint is r(4,-5) find the coordinates of the other endpoint 
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Get the x and y differences:
diffx = 4-1 = 3
diffy = -5 -(-2) = -3
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Subtract the differences from the midpoint:
x: 1-3 = -2
y: -2 + 3 = 1
--> (-2,1)