Originally Posted by

**Euclid Alexandria** Expression to be simplified: **-9y + 2 - 4y - 8x + 12 - x**

My answer:

Step 1: Change values

-9y + 2 - 4y - 8x + 12 - x **= -9y + 2 + (-4y) + (-8x) + 12 + (-1x)**

Step 2: Apply commutative property

**= -9y + (-4y) + 2 + 12 + (-8x) + (-1x)**

Step 3: Combine like terms

**= (-9 + [-4])y + 2 + 12 + (-8 + [-1])x**

Step 4: Simplify

**= -13y + 14 + (-9x)**

Should this actually be written as **-13y + 14 - 9x**? Should terms without variables be added after those with variables? Do these things matter? The books gives an answer of **-13y - 9x + 14**.