Angle Bisector in Triangle at Vertex A

Very Hard Geometry And Measurement Coordinate Geometry

In the coordinate plane, consider the triangle with vertices at points A(1, 1), B(4, 5), and C(7, 1).

Determine the equation of the line that bisects the angle at point A in this triangle.

$$y - 1 = \frac{4}{3}(x - 1)$$

$$y - 1 = \frac{1}{3}(x - 1)$$

$$y - 1 = \frac{3}{4}(x - 1)$$

$$y - 1 = -\frac{3}{4}(x - 1)$$

$$y - 1 = \frac{4}{1}(x - 1)$$

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