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How far away should M' be placed from the line of reflection?

How far away should M' be placed from the line of reflection?-example-1
User Yoruba
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When we apply a reflection over the y-axis to a shape, we just have to change the sign of the x-coordinate of each point, in this case, point M is located at (-3,1), when we reflect the figure point M changes to M'(3,1), then point M' is located 3 units away from the line of reflection (y-axis).

User Greg Mulvihill
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