6x + 2y - 8 = 0
put this equation into y=mx+b form
subtract 6x from both sides
2y-8=-6x
add 8 to both sides
2y = -6x+8
Divide both sides by 2
y=-3x+4
so both equations though they look different at first are equations for the same line so your table should have similar values for both.
Here are a few points that lie on both lines
(-1,7)
(0,4)
(1,1)
(2,-2)
(3,-5)
(4,-8)
(5,-11)
(6,-14)
(7,-17)