The vertices of a figure are given. Rotate the figure as described. Find the coordinates of the image. A(−1, 1), B(2, 3), C(2, 1)
90∘ counterclockwise about vertex A

the answer is B sorry if its wrong

Step-by-step explanation:

have a nice day/night

the sum of all the angles in a triangle are equal to 180

so you can add   the 3 given angles together to equal 180:

5y + 2y + 2y = 180

or since all three angles have the same letter, combine the 3 angles to equal 180:

9y = 180