Verona is solving the equation –3 + 4x = 9. in order to isolate the variable term using the subtraction property of equality, which number should she subtract from both sides of the equation?
a. –4
b. –3
c. 3
d. 4

-3 + 4x = 9 

To isolate x, you need to add 3 to both sides. For the answer choices provided, B is correct.

-3 -(-3) = 0 

The answer to this question is B. -3

The answer can't be A because the problem has nothing to do with -4.

The answer cannot be 3 because if you subtract 3 from both sides, the 4x will not be alone on one side because -3 - 3 = -6.

The answer can't be 4 because 4 is what the equation will have to be divided by on both sides.