If you're seeing this message, it means we're having trouble loading external resources on our website. If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked. This page will take a look at a few of the various examples that utilize the concept of slopes associated with parallel and perpendicular lines. Questions Asking Directly for Equations of Parallel or Perpendicular Lines: 1. What is the equation of a line parallel to y = -4x + 5 and passing through the point (6,-3)? Solution: The slope of the given line, y = -4x + 5 is -4 (remember y = mx + b). 2. What is the equation of a line perpendicular to 2y = x - 4 and passing through the point (-4,1)? Solution: The slope of the given line, 2y = x - 4
is ½ (remember to solve for y first). Questions Asking Indirectly for Equations of Perpendicular Lines: 3. What is the equation of a line tangent to a circle whose equation is (x - 5)2 + (y + 2)2 = 25 at the point (8,-4), which lies on the circle ? Solution: The circle (x - 5)2 + (y + 2)2 = 25 has a center at (5,-2) and a radius of 5. 4. A line through point (-3,4) is perpendicular to the line y = 2x - 3. Find the point where the lines intersect.
5. Find the area of parallelogram DUEF, as shown below, by finding its base and a height to that base. (Round area to nearest square unit).
What is the equation of parallel lines?Two lines are parallel lines if they do not intersect. The slopes of the lines are the same. f(x)=m1x+b1 and g(x)=m2x+b2 are parallel if m1=m2 f ( x ) = m 1 x + b 1 and g ( x ) = m 2 x + b 2 are parallel if m 1 = m 2 .
How do you know when an equation is parallel and perpendicular?Key Takeaways. Parallel lines have the same slope.. Perpendicular lines have slopes that are opposite reciprocals. In other words, if m=ab, then m⊥=−ba.. To find an equation of a line, first use the given information to determine the slope. ... . Horizontal and vertical lines are perpendicular to each other.. |