Question

How to do number 28?

Answer 1

In this problem, they want you to take the triangle and flip it over the line. It's going to create a mirror image on the other side.

That line is y = x, which is just a basic plain diagonal line that goes bottom left to top right.

To start, I would ALWAYS write down the coordinates of the original triangle.

D (-1, 3)

F (-3, 1)

E (-1, 1)

Now, here's the trick

Anytime it asks you to flip over Y = X, remember that you just flip X and Y!!!

(X, Y) --> (Y, X)

Your new coordinate points are going to be:

D (3, -1)

F (1, -3)

E (1, -1)

Now, just plot those points, connect the dots, and you have your new, mirrored triangle!