Question

Ab¯¯¯¯¯¯ has endpoints a(2, 4) and b(8, y). if ab is 10, what is the value of y?

Answer 1

10=✓(36+(y-4)²)

10=✓36+y²-8y+16

10=✓y²-8y+52

100=y²-8y+52
y²-8y-48=0

(y+4)(y-12)=0

y=-4 or y=12