Martin was given this expression to simplify: 23x + xy - y + 3y +5 - 20x + 6xy
What were Martin's errors? Check all that apply.
The combined coefficients of the x terms should be
3x, not 43x.
He simplified the expression to:
43x + 7xy -3y
The 7xy should be -7xy.
The coefficients of the y terms have been multiplied.
When you combine like terms, you add or subtract
the coefficients.
The constant was left off.
The terms xy and 6xy are not like terms because
there are two variables.