Question

the distance between the points (3,1) and (0,Y) is 5.find y.​

Answer 1

distance=

$\sqrt{(3 - 0) { }^{2} + (1 - y) {}^{2} } = 5 \\ 9 + (1 - y) { }^{2} = 25 \\ (1 - y) { }^{2} = 16 \\ 1 - y = + - 4 \\ y = 5 \: or \: - 3$