Q:

what set of transformations could be applied to rectangle ABCD to create A’B’C’D’?A)Reflected over the x-axis and rotated 180 degreesB)Reflected over the y-axis and rotated 180 degrees C)Reflected over the x-axis and rotated 90 degrees counterclockwise D)Reflected over the y-axis and rotated 90 degrees counterclockwise

Accepted Solution

A:
Rectangle ABCD has vertices A(-4,2), B(-4,1), C(-1,1) and D(-1,2).1. Apply the reflection over the x-axis that has a rule(x,y)→(x,-y).ThenA(-4,2)→A''(-4,-2);B(-4,1)→B''(-4,-1);C(-1,1)→C''(-1,-1);D(-1,2)→D''(-1,-2).2. The second transformation is rotation by 90° counterclockwise about the origin. This transformation has a rule(x,y)→(-y,x).ThenA''(-4,-2)→A'(2,-4);B''(-4,-1)→B'(1,-4);C''(-1,-1)→C'(1,-1);D''(-1,-2)→D'(2,-1).As you can see these points are exactly those frome the diagram.Answer: 1st transformation is reflection over the x-axis and second transformation is rotation by 90° counterclockwise about the origin.