3x+1/2=9 1/2

A x=-3
B=x=3
C=x=-10/3
D=x=10/3

B = x = 3

Step-by-step explanation:

Isolate the variable by diving each side by factors that don't contain the variable.

the answer is (4,3)

since the rule for r0, 90º is (-y,x) and it was already applied to form the image, all you have to do is reverse the answer using this formula.