Question

If P (-1 , 1) is the midpoint of the line segment joining A (-3 , b) and B (1, b + 4) , then b is equal to:
a) 1
b) -1
c) 2
d) 0
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Answer 1

Answer:

b

mid point formula is a+b/2

-3+1/2,2b+4/2 = -1,1

2b= 2-4

2b=-2

b= -1