ax + by + c = 0 does not represent an equation of line, if ______.
Aa = c = 0, b ≠ 0
Bb = c = 0, a ≠ 0
Ca = b = 0
Dc = 0, a ≠ 0, b ≠ 0
ax + by + c = 0 does not represent an equation of line, if ______.
Aa = c = 0, b ≠ 0
Bb = c = 0, a ≠ 0
Ca = b = 0
Dc = 0, a ≠ 0, b ≠ 0