liberal art math
posted by charles .
slope intercept form of x + 3y + 6

assuming the 2nd "+" to be "=" (forgot to shift key) and you meant
x + 3y = 6
rearrange terms to get y on the left
3y = x6
now divide by 3 to get
y = 1/3 x  2
slope is 1/3
intercept is 2