Question

1. 2x + 3y - 4 - 5x + 6y - 7

Explanation:

Step1: Group like x terms

$(2x - 5x) + 3y - 4 + 6y - 7$

Step2: Simplify x terms

$-3x + 3y - 4 + 6y - 7$

Step3: Group like y terms

$-3x + (3y + 6y) - 4 - 7$

Step4: Simplify y terms

$-3x + 9y - 4 - 7$

Step5: Combine constant terms

$-3x + 9y + (-4 - 7)$

Step6: Simplify constants

$-3x + 9y - 11$

Answer:

$-3x + 9y - 11$