Question

The coordinates of point M are (x, -3). If the distance from point M to the y-axis is 9 units, list all values of x?

Answer 1

`x in {-9,+9}`

Explanation:

For the generalized coordinate: `(a,b)`
`a` represents the displacement from the y-axis and
`b` represents the displacement from the x-axis.

If the distance from the y-axis is `9` units then the displacement is `+-9` from the y-axis.