Look at the given equations.
-3x + 4 = 5x -6
Roy and Sam start solving the equation as follows.

Roy's work Sam's work
-3x + 4 = 5x - 6 -3x + 4 = 5x -6
-8x + 4 = -6 4 = 2x -6

Which student's work is correct so far and what property did he use?
A. Roy's work is correct so far. He used the addition property of equality.
B. Roy's work is correct so far. He used the subtraction property of equality.
C. Sam's work is correct so far. He used the addition property of equality.
D. Sam's work is correct so far. He used the subtraction property of equality.