\( \triangle Q R S \) contains the points: \( Q(4,2) R(5,1) S(3,7) \). If the triangle is reflected across the \( y \)-axis, what will \( S \) : \( S \) would be 3

When reflecting a point across the \( y \)-axis, the \( x \)-coordinate changes its sign, while the \( y \)-coordinate remains the same. Given the original coordinates of point \( S \) are \( S(3, 7) \): 1. **Original Coordinates of \( S \):** \[ S(3, 7) \] 2. **Reflection Across the \( y \)-Axis:** \[ S'(-3, 7) \] - The \( x \)-coordinate changes from \( 3 \) to \( -3 \). - The \( y \)-coordinate remains \( 7 \). **Final Answer:** After reflection, point \( S \) is at \( S'(-3, 7) \).