Describe and correct the error a student made when solving kx + 3x = 4 for x.
kx + 3x = 4
kx + 3x - 3 = 4 - 3x
kx= 4-3x
kx/k = 4-3x/k
x= 4-3x/k
Describe the error the student made. Choose the correct answer below.
A.
The equation was not solved for x because x appears on both sides of the equation.
B.
The solution is not complete until the student subtracts 3 from 4 in the last line.
C.
The equation was not solved for x because k is still in the equation.
D.
The student cannot divide both sides by k in the fourth line without knowing that k is not equal to 0.