Answer:
The correct option is B.
In step one he should have added 3 negative x-tiles to both sides.
Step-by-step explanation:
Given the equation
3x + 1 = 4x + (-4)
Adding 3 negative x tiles, we have
3x + 1 + (-3x) = 4x + (-4) + (-3x)
1 = x - 4
x = 1 + 4 = 5
