Which is true of the standard form of the equation of the line graphed?
the value of a can be –1 if the value of c is 3 and the value of b is 0.
the value of a can only be 1, the value of c can only be –3, and the value of b is 0.
the standard form of the equation can be shown as 3x = –9.
the standard form of the equation can only be x + 3 = 0.