Predict what will happen to the coordinates of a point (x, y) as the point reflects across a line to produce point (x', y'). Choose the x-axis, y-axis, y = x and y = -x for the lines of reflection. Express your answers in terms of x and y. (Be sure to watch your signs?

Question

Predict what will happen to the coordinates of a point (x, y) as the point reflects across a line to produce point (x', y'). Choose the x-axis, y-axis, y = x and y = -x for the lines of reflection. Express your answers in terms of  x and y. (Be sure to watch your signs?

welshfella · Answer

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welshfella · Answer

take the points P and image P'  in above diagram.
this is a reflection in the y-axis

what can you say about the  value of the y coordinate of P and P'?