91Ó°ÊÓ

$x=a$is a vertical line.

$y=b$ is a horizontal line.

To graph a line, use the $x$-Intercept, and the $y$-Intercept, if the line has them.

To find the $x$-intercept, substitute $y=0$in the function and calculate $x$coordinate.

Plot the point $\left(x,0\right)$in the coordinate plane.

To find the $y$-intercept, substitute $x=0$in the function and calculate $y$coordinate.

Plot the point $\left(0,y\right)$in the coordinate plane.

Since two points are sufficient to draw the line, this is the easiest way to find the points on that line.

Draw the line through the plotted points.

If the line does not have the $x$-intercept, it follows that the line is parallel to the $x$-axis.

Line that is parallel to the $x$-axis has the equation $y=n$, where $n$is real number.

If the line does not have the $y$-intercept, it follows that the line is parallel to the $y$-axis.

Line that is parallel to the $y$-axis has the equation $x=n$, where $n$is real number.

If it only has one variable, it is a vertical or horizontal line.

$x=a$is a vertical line passing through the $x$-axis at $a$.

$y=b$is a horizontal line passing through the $y$-axis at $b$.