Can someone please help me with this Math problem? I’m trying to help my younger brother with his homework.

Question

The X-axis is a line of symmetry for a triangle. The coordinates of two of its vertices are (1, -1) and (7,0).

(A) (-7,0)

(B) (1,1)

(C) (-1,-1)

(D) (1,-7)

My brother got (A) and I got (D), are either of us correct?

Answer 1

B (1,1)

the triangle has the x axis as a line of symmetry if the triangle is (1,-1), (1,1) and (7,0)

the x axis runs down the middle of the triangle