Ann wrote the following steps to simplify the expression (−y + 3y + 2x).

Step 1: −2x + y + 3y; using commutative property of addition
Step 2: −2x + (y + 3y); using associative property of addition
Step 3: −2x + (1 + 3)y; using distributive property of addition
Step 4: −2x + (4)y; simplifying

Which step was incorrect, and what should be the correct step that Ann should use?

Question

Ann wrote the following steps to simplify the expression (−y + 3y + 2x).
 
Step 1: −2x + y + 3y; using commutative property of addition
Step 2: −2x + (y + 3y); using associative property of addition
Step 3: −2x + (1 + 3)y; using distributive property of addition
Step 4: −2x + (4)y; simplifying
 
Which step was incorrect, and what should be the correct step that Ann should use?