All topicsLinear FunctionsParallel and perpendicular lines
Grade 8–9 · Free practice
Parallel and perpendicular lines
Parallel lines share a slope; perpendicular slopes are negative reciprocals. Write equations of each.
Try it: three questions
Real questions from the practice bank. Tap an answer to check it.
Question 1 of 3
Line L passes through points (2, 3) and (5, 9). Line M is perpendicular to line L. What is the slope of line M?
Question 2 of 3
Line AB passes through points A(2, 1) and B(5, 7). Line CD is perpendicular to line AB. What is the slope of line CD?
Question 3 of 3
Line AB passes through points A(2, 3) and B(6, 7). Line CD is perpendicular to AB and passes through point C(4, 1). What is the slope of line CD?
How this fits in
Parallel and perpendicular lines is one skill in the Linear Functions unit. Students read the unit lesson, then earn a bronze, silver, or gold medal on their last 10 answers. Medals never go down. A mastered unit comes back for review after 1, 3, 7, 16, and 35 days so it stays learned.
Practice parallel and perpendicular lines until it sticks
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