find y for which distance between the points A(3,-1) and B(11,y) is 10 units
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Distance between A( 3,-1) and B( 11,y)
is √(11-3)^2 + ( y+1)^2 = 10( given)
squaring
8^2 + ( y+1)^2 = 100
(y+1)^2= 100 -64 = 36
y +1 = +-6
y = 6-1, -6 -1
= 5, -7
is √(11-3)^2 + ( y+1)^2 = 10( given)
squaring
8^2 + ( y+1)^2 = 100
(y+1)^2= 100 -64 = 36
y +1 = +-6
y = 6-1, -6 -1
= 5, -7
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