(B) it is
The statment 1 flips the x and y... (r, s) is definied by 3r + 2s = 6 and R is 2x + 3y = 6 <=> 2r + 3s = 6.
So we have 1 point of intersection for the 2 lines that makes yes and all the other points of 3*x+2*y = 6 that are out
This is insufficient
Fig, Can you pls. explain how one determines whether a point (r,s in this case) is in the same region as another point? Sure we can plot the rough graphs of both equations. But so what? Thanks.