Question

y=3x-1
4,1
2,5
4,3
0,-3

Answer 1

here just plug in your x values and see which is true for the y value

Answer 2

right! let me the first one, just as an example. 1=3(4)-1 . That right translates to 1=12-1
Finally, that says that 1=11. However, we know that is not true so we try the rest until we find one that is correct. Make sense? @wolowizzard ?