# 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?

Dec 8, 2016

$x \in \left\{- 9 , + 9\right\}$
For the generalized coordinate: $\left(a , b\right)$
$a$ 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 $\pm 9$ from the y-axis.