Question

Karen wrote the following steps to simplify the expression: 4 – (2x + 3x – 1).

0---4 – (2x + 3x – 1)---Given
1---4 – 2x – 3x + 1---Distributive Property
2---4 + 1 – 2x – 3x---Associative Property of Addition
3---(4 + 1) + (–2x – 3x)---Associative Property of Addition
4--5 – 5x--Combine Like Terms

Which step of justification is incorrect, and what should the justification for that step be to simplify the expression?

Step 4; Distributive Property
Step 2; Commutative Property of Addition
Step 3; Associative Property of Multiplication
Step 1; Multiplication Property of Equality