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### Course: Geometry (all content)>Unit 10

Lesson 9: Old transformations videos

# Performing reflections: line (old)

An older video where Sal uses the interactive widget to find the image of a line under a reflection. Created by Sal Khan.

## Want to join the conversation?

• Is there any transformation you can even do to the line to make it not be a line any more?
• What if it says " Reflection the line across y=x " ?
• that would be a slope of 1 so it would go through the origin and cross at (1,1) (-1,-1)
(1 vote)
• I`m in 8th grade and i tried the practice quizzes but still don`t get transformations help?
• if A(4,-5) then the image after A is reflected over y-3 is?
• If my point was (-3,-5) and I had to reflect across Y =-1 how would I do that
• Not Able To Understand the lessons what does it means by reflect the line across y=-4
• When reflecting a figure over two lines that are intersecting (does not have to be the axis' just two lines in general) why does it always equal a rotation from the original figure?
• You don't get a rotation. If it was really a rotation, then the reflection would be upside down which is not the case.
But, the interesting point is that one 180 rotation is the equivalent of two reflection ( one over the x-axis, and the second over the y-axis and vice versa)
Hope this helps !
And sorry if my answer is wrong or unclear.
(1 vote)
• How do you solve this without a reflect tool?