If ABC is reflected across the y-axis then the coordinates of c is (-5,3).
What are coordinates?
The coordinates refers to a point on the graph which are used to draw a line, a shape on the graph by plotting these points.
How to determine coordinates?
The coordinates of ABC presently are (1,3),(3,6),(5,3). If we just reflect ABC cross y-axis then on the second quadrant only the value of x changes, the value of y remains same. So we have to just put a negative sign in front of the value of x and it becomes -5 with the value of y=3.
Hence the coordinates of C is (-5,3).
Learn more about coordinates at https://brainly.com/question/17206319
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