Triangle has vertices at a (1,3), b(4,2), and c (3,8). which transformation would produce an image with vertices a'(3, -1), b(2,-4), c' (8, -3)

You would have a 90 degree clockwise rotation. 

Rules:

90 Clockwise: Flip, change right sign / y, -x
90 Counter CW: Flip, change left sign. / -y, x

If the triangle is moved 90°C to the left. 

A)26•2=52there are 2 sides with the same length116-52=64the other 2 side have to be half of 64 each64/2=32the width is 32b)make two sentences about these steps because your teacher knows how you write and explain things.

Y=-3x is the correct answer