Question

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?
Answer
Step 2 was incorrect. Correct step: −2x + (y − 3y); using associative property of addition
Step 1 was incorrect. Correct step: 2x +3y − y; using commutative property of addition
Step 2 was incorrect. Correct