$\"\"$

The two lines equations are $\"\"$ and $\"\"$ .

Line equation in slope-intercept form $\"\"$ , where $\"\"$ is slope and $\"\"$ is

$\"\"$ -intercept.

Consider $\"\"$ .

Compare it with slope-intercept form.

$\"\"$ and $\"\"$ .

Consider $\"\"$ .

Compare it with slope-intercept form.

$\"\"$ and $\"\"$ .

Perpendicular lines slopes are negative reciprocal to each other.

Since slopes of the above two lines are negative reciprocals to each other, the lines are perpendicular.

$\"\"$

Perpendicular lines.