Which of the following coordinates exists on the line y = 3x + 1? A. (3, 1) B. (-1, -2) C. (-3, 4) D. (2, 6)

Hey there! :D

All you need to do is plug in the points and see if they work. 

y=3x+1; (3, 1)

1= 3(3)+1

1=10 <== this does not work 

y=3x+1; (-1,-2)

-2= 3(-1)+1

-2=-3+1

-2=-2 <== this works

"B" is the answer. 

I hope this helps!
~kaikers