# A triangle is drawn through A(1,2), B(3,4), C(4,-1). Find the

A triangle is drawn through A(1,2), B(3,4), C(4,-1). Find the coordinates of this figure reflected across the x-axis.

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Clara Reese
To reflect across the x-axis, multiply y by -1.
$$\displaystyle{A}{\left({1},{2}\right)}\to{A}'{\left({1},-{2}\right)}$$
$$\displaystyle{B}{\left({3},{4}\right)}\to{B}'{\left({3},-{4}\right)}$$
$$\displaystyle{C}{\left({4},-{1}\right)}\to{C}'{\left({4},{1}\right)}$$
The needed coordinates are $$\displaystyle{A}'{\left({1},-{2}\right)},{B}'{\left({3},-{4}\right)}{\quad\text{and}\quad}{C}'{\left({4},{1}\right)}$$.