If the coordinate point C(1, -4), if rotated 90 degrees counterclockwise about the origin, it becomes C'(-(-4),1) which is C'(4, 1). If the coordinate is reflected across the y-axis, the resulting x-coordinate will be -4
From the question given, if the point C(x, y) is rotated 90 degrees counterclockwise about the origin, it becomes C'(-y,x).
We can see that;
- There was a switch in coordinates
- The y-coordinate was negated
Given the coordinate point C(1, -4), if it is rotated 90 degrees counterclockwise about the origin, it becomes C'(-(-4),1) which is C'(4, 1)
If the coordinate is reflected across the y-axis, the resulting x-coordinate will be -4
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