Question

Find the coordinates of a point on the y axis which is at a distance of 13 units

from the point (12, 9)​

Answer 1

Answer:

(The x-coordinate is 0 since it is on the y-axis.) The square of the distance from this point to (12, 9) needs to be 13² = 169 (it's easier and tidier to work with squares of distances). => y = 4 or 14