Question

@iGreen

Answer 1

The vertices of figure STUV have coordinates S(−2, 2), T(2, 3), U(1, −1), and V(−3, −1). The vertices of figure SꞌTꞌUꞌVꞌ have coordinates Sꞌ(−2, −2), Tꞌ(2, −3), Uꞌ(1, 1), and Vꞌ(−3, 1).

Which transformation of figure STUV produced figure SꞌTꞌUꞌVꞌ?


A.
a reflection across the x-axis

B.
a reflection across the y-axis

C.
a rotation 90° clockwise around the origin

D.
a rotation 90° counterclockwise around the origin

Answer 2

Okay, what do you see about the points?

Point S = (-2, 2)
Point S' = (-2, -2)

Point T = (2, 3)
Point T' = (2, -3)

Answer 3

Some of them are becoming opposite (Positive/negative)

Answer 4

Which one's?

Answer 5

x-values or y-values?

Answer 6

Seemingly y-values

Answer 7

Yep, you got it.

Answer 8

What are we doing to the y-values?

Answer 9

I was wanting to say B at first

Answer 10

No, reflection across the y-axis will be (-x, y) or multiplying -1 to the x-values..

Answer 11

In Point S, the y-value is 2, then it becomes negative.

In Point T, the y-value is 3, then it becomes negative.

So we're multiplying what to the y-values?

Answer 12

-1

Answer 13

2 x -1,
3 x -1

Answer 14

Correct, and which one wants us to multiply -1 to the y-value?

Hint: We just did it in our last question.

Answer 15

(Slow computer, one second please)

Answer 16

Well its turning 2 and 3 to negative, so...(Still lost....Sorry)

Answer 17

Reflection across x-axis:

(x, -y)

Reflection across y-axis:

(-x, y)

Rotation of 90 degrees clockwise:

(y, -x)

Rotation of 90 degree counterclockwise:

(-y, x)

Answer 18

Which one?

Answer 19

Across x-axis. (A)

Answer 20

Correct.

Answer 21

Thanks :)