Which of the following equations does the graph below represent?
A. 3x + 7y = 21
B. -3x + 7y = 21
C. x + 7y = 21
D. -3x + y = 21
![Which of the following equations does the graph below represent A 3x 7y 21 B 3x 7y 21 C x 7y 21 D 3x y 21 class=](https://us-static.z-dn.net/files/dc4/fd3c2146199314b74271b7dd16d677f2.png)