# TSI Math: Reflecting a Triangle across the y-Axis

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ΔABC has points A (0, 8), B (-3, 7), and C (1, -2). Where are these points after we reflect the triangle across the y-axis?

Geometry and Measurement | Transformations and Symmetry |

Mathematics and Statistics Assessment | Transformations and Symmetry |

Product Type | TSI |

TSI | Mathematics and Statistics Assessment TSI Math TSI Mathematics |

TSI Math | Geometry and Measurement |

TSI Mathematics | Geometry and Measurement |

Test Prep | TSI |

### Transcript

reflection when the points reflected over the y axis you

know the tall one there it goes from one side

of the access to a point on the other side

just is far away If the points at x equals

negative three Well count over to the y axis One

two three then continue going And other three points one

two three toe add a point two x equals three

they're both three units away from the y axis but

on opposite sides Thank ya know reeves the matrix in

short when appointed reflected across the y axis the sign

of all the x values changes the y values on

the other hand don't change at all The image isn't

moving up and down in any way just side to

side so it's come back to point a in a

minute and i'll start with b and c Well we

already talked about point being negative three seven of it

since exits negative three moves to x equals three and

the y value doesn't change it all That brings us

to be prime there which is three seven right They're

using the same method on seve got one negative to

swap The sign of x x equals one Their tow

x equals negative one And don't touch the y value

at all not even with a ten foot wall So

now we get c prime is negative one negative too

and now look att a You have zero eight leave

Why alone because again there's no up or down movement

there and the sign of the x value hadn't changed

though either because well don't have a sign it Zero

there A prime is actually the same as a so

we have zero comma eight putting it all together The

answer is zero eight and then three seven and then

negative one Negative too so well that's it The the 00:01:48.046 --> [endTime] answer is b We're swamped and reflected