Frequently Asked Questions
How do you write a line parallel to another line?
Use the same slope. If the reference is y equals m x plus b and you want to pass through (x naught, y naught), the new line is y equals m x plus (y naught minus m times x naught).
What makes two lines parallel?
They share the same slope and never meet (assuming distinct intercepts). Vertical lines are parallel when they share the same form x equals constant.
Parallel versus perpendicular?
Parallel lines share slope. Perpendicular lines have slopes whose product is minus one, that is, slopes are negative reciprocals of each other.
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