Consider the following diagram:
Select the description that transforms the ordered pair from Point $D$D to Point $D$D$′$′.
The $x$x-coordinate became the $y$y-coordinate and the $y$y-coordinate became the $x$x-coordinate.
The sign of the $x$x-coordinate is the opposite.
The signs of the $x$x and $y$y-coordinate are the opposite.
The sign of the $y$y-coordinate is the opposite.
Select the line of reflection that transforms $D$D to $D'$D′.
$y=x$y=x
$y=0$y=0
$y=-x$y=−x
$x=0$x=0
The coordinates of point $A$A are $\left(1,4\right)$(1,4).
If point $C$C$\left(-9,7\right)$(−9,7) is reflected across the line $y=-x$y=−x to produce point $D$D, determine the coordinates of point $D$D.
Consider the following diagram: