Mahmut S. answered • 07/19/21

SAT Math Expert

Hello, Jesset

You get it right because the point (-9, 0) is already on the x-axis so do not worry about it

when you reflect (-4, -4) over x axis you get D

Jesset C.

asked • 07/19/21I’m helping my younger brother with his homework, and I just want to make sure I’m helping him correctly.

The x-axis is a line of symmetry for a triangle. The coordinates of two of its vertices are (–4, –4) and (–9, 0). What are the coordinates of the third vertex?

[A] (–4, 9)

[B] (4, –4)

[C] (9, 0)

[D] (–4, 4)

I got [D] and he got [A], are either of us correct?

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Mahmut S. answered • 07/19/21

Tutor

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SAT Math Expert

Hello, Jesset

You get it right because the point (-9, 0) is already on the x-axis so do not worry about it

when you reflect (-4, -4) over x axis you get D

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