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Find the equation of the perpendicular bisector of the segment AB, if A(2, 2) and B(4, −6). If the perpendicular bisector of AB intercepts the y-axis at point P, what are the lengths of PA and PB?
Answers
Answer:
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Step-by-step explanation:
step 1
Find the midpoint AB (because a bisector divide into two equal parts)
we have
A(3, 0) and B(–1, 2)
step 2
Find the slope AB
we have
A(3, 0) and B(–1, 2)
The formula to calculate the slope between two points is equal to
substitute the values
step 3
Find the slope of the perpendicular bisector of the segment AB
Remember that
If two lines are perpendicular, then their slopes are opposite reciprocal (the product is equal to -1)
m1*m2=-1
we have
so
step 4
Find the equation of the perpendicular bisector of the segment AB
we have
-----> midpoint AB
substitute
Convert to slope intercept form
step 5
Find the x-intercept (point P)
For y=0
0=2x-1
2x=1
x=0.5
The x-intercept is the point P(0.5,0)
step 6
Find the length PA
we have
P(0.5,0),A(3,0)
the formula to calculate the distance between two points is equal to
substitute the values
step 7
Find the length PB
we have
P(0.5,0),B(-1,2)
the formula to calculate the distance between two points is equal to
substitute the values