Which facts could be applied to simplify this expression? Check all that apply. 5x + 3y +(-x) + 6z 1. To add like terms, add the coefficients, not the variables.
2. First add 5x + x.
3. The simplified expression is 4 x + 3 y + 6 z.
4. Only combine terms that contain the same variable.
5. The simplified expression is 5 x + 3 y + 6 z