Determine coordinates of reflection given equation

In summary, reflection in terms of coordinates involves transforming a point or object across a line of reflection to create a mirror image. The line of reflection can be determined by finding the slope of the equation and the formula for finding the coordinates of reflection is (x,y) --> (x,-y) or (x,y) --> (-x,y), depending on the line of reflection. An example of finding the coordinates of reflection is (3,5) reflected across the x-axis to (3,-5). To check if the coordinates are correct, you can graph the points and see if they are symmetric or substitute the reflected point into the original equation.
  • #1
euro94
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Homework Statement


Find the coordinates of reflection of the point P (4,8) in the line y=-3/2 x + 14


Homework Equations



y= -3/2x + 14

The Attempt at a Solution


find a point on the line?
 
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  • #2
Can you find the equation of the line through (4, 8), perpendicular to that line? Do you see why you want that?
 
  • #3
would you have to sub in the point 4,8 in the equation and find the dot product?
 

FAQ: Determine coordinates of reflection given equation

What is reflection in terms of coordinates?

Reflection in terms of coordinates refers to the transformation of a point or object on a coordinate grid across a line of reflection. This creates a mirror image of the original point or object on the other side of the line.

How do you determine the line of reflection given an equation?

To determine the line of reflection given an equation, you first need to find the slope of the line. This can be done by rearranging the equation to the form y = mx + b, where m is the slope. The line of reflection will be perpendicular to this line and will have the same y-intercept.

What is the formula for finding the coordinates of reflection?

The formula for finding the coordinates of reflection is (x,y) --> (x,-y) or (x,y) --> (-x,y), depending on whether the line of reflection is the x-axis or the y-axis, respectively. This means that the x-coordinate stays the same, while the y-coordinate is multiplied by -1.

Can you give an example of finding the coordinates of reflection?

Yes, for example, if the original point is (3,5) and the line of reflection is the x-axis, the reflected point would be (3,-5). If the line of reflection is the y-axis, the reflected point would be (-3,5).

How can you check if the coordinates of reflection are correct?

You can check if the coordinates of reflection are correct by graphing the original point and the reflected point on a coordinate grid and verifying that they are symmetric across the line of reflection. You can also substitute the reflected point into the original equation and see if it satisfies the equation.

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