i need help im really confused with this if your explanation is good then ill give brainiest and 5 stars

Explanation:

Focus on the x terms for now. We have 10x and 2x. Saying 10x+2x is like saying "10 boxes +  2 boxes = 12 boxes". We can replace "boxes" with "x" to say 10x+2x = 12x

The y terms are a similar story, and -5y-3y = -8y. It might help to set up a number line to see why -5-3 turns into -8.

12x - 8y

Step-by-step explanation:

=> 10x - 5y + 2x - 3y

=> (10x + 2x) + (-5y - 3y)

=> 12x + (-8y)

=> 12x - 8y

walter needs to make at least 5 more cookies but no more than 40. 5 ≤ x ≤ 40

step-by-step explanation:

20 ≤ x + 15 ≤ 55

subtract 15 from all parts

20-15 ≤ x + 15-15 ≤ 55-15

5 ≤ x ≤ 40

this means how many more cookies he has to make

walter needs to make at least 5 more cookies, but no more than 40 cookies; 5 ≤ x ≤ 40

the answer is (-4,-4)

hope this ! : d