Question

Girardo is using the model below to solve the equation 3x+1=4x+(-4)​

Answer 1

x = 5

Explanation:

`3x+1=4x+(-4)\qquad\text{subtract}\ 4x\ \text{from both sides}\\\\3x-4x+1=4x-4x-4\\\\-x+1=-4\qquad\text{subtract 1 from both sides}\\\\-x+1-1=-4-1\\\\-x=-5\qquad\text{change the signs}\\\\x=5`

Answer 2

The answer is B. In step one he should have added 3 negative x-tiles to both sides.

Explanation: