Question

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Martin was given this expression to simplify:


23x + xy – y + 3y + 5 – 20x + 6xy


He simplified the expression to:


43x + 7xy −3y


What were Martin’s errors? Check all that apply.

-The combined coefficients of the x terms should be 3x, not 43x.

-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.

Answer 1

Answer:

Step-by-step explanation:

23x + xy - y + 3y + 5 - 20x + 6xy = 23x - 20x + xy  + 6xy -y + 3y + 5

                                                    = 3x + 7xy + 2y + 5

Errors:1) The combined coefficients of the x terms should be 3x, not 43x

2) The coefficients of the y terms have been multiplied.

3) The constant was left off.