First rewrite the equation into slop intercept form. Assuming that you copied the equation correctly, since I don't see an x value, to rewrite, the 6 will need to be moved to the right side of the equation and combined with the negative 6.
6 - 2y = -6 subtract 6 on both sides
-2y = -12 divide both sides by -2
y = 6
The final equation indicates that this is a horizontal line that goes through the y axis at 6 so the y intercept is 6.