Https://www.illustrativemathematics.org/content-standards/tasks/703 check it out it might help
Answer: y= 3x
Step-by-step explanation:
1. The question lack info
R = x(A+B)
distribute
R=Ax+Bx
subtract Ax from each side
R-Ax=Bx
divideby x
(R-Ax)/x =B
Choice C
I need a picture to find the answer