It is to insure the experiment does not have bias.
It’s going to be -2 because the y intercept is when x=0.
Isolate the x
divide 3 from both sides
3x/3 > 6/3
x > 6/3
x > 2 is your answer
Note: because you are not dividing by a negative number, you do not need to flip the sign
hope this helps
