Question

1. $6x + 4y + x - y$

answer: _______

Explanation:

Step1: Group like x terms

$6x + x + 4y - y$

Step2: Combine x terms

$(6+1)x + 4y - y = 7x + 4y - y$

Step3: Combine like y terms

$7x + (4-1)y = 7x + 3y$

Answer:

$7x + 3y$