Are these two lines parallel, perpendicular or neither?
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To determine if two lines are parallel, perpendicular, or neither, you can analyze their slopes. If the slopes are equal, the lines are parallel. If the product of their slopes equals -1, they are perpendicular. For example, if you have one line with a slope of 2 and another with a slope of -1/2, these lines are perpendicular because 2 * (-1/2) = -1! Now, if you're working with a coordinate system, remember that vertical lines have an undefined slope, while horizontal lines have a slope of 0. An easy rule of thumb is: horizontal and vertical lines are always perpendicular! So, keep an eye out for those angles!