It's the option D, the reflection doesn't change y coordinate
Well D=8.5C so divide 68 by 8.5 (answer is 8)
V +

= 8
First, simplify

to 3. / Your problem should look like: v + 3 = 8.
Second, subtract 3 from both sides. / Your problem should look like: v = 8 - 3.
Third, simplify 8 - 3 to 5. / Your problem should look like: v = 5, which is your answer.
Y = -5 / 4 x 3
-5 / 4 = -1.25 x 3 = -3.75
y = - 3.75