Question

reflect point b across the x - axis.

Explanation:

Step1: Determine the coordinates of point B

From the graph, point B has coordinates \((1,-2)\).

Step2: Apply the reflection rule across the x - axis

The rule for reflecting a point \((x,y)\) across the \(x\) - axis is \((x,-y)\).
For point \(B(1,-2)\), substituting \(x = 1\) and \(y=-2\) into the rule, we get \((1,-(-2))=(1,2)\).

Answer:

The reflected point of \(B\) across the \(x\) - axis is \((1,2)\)