You have $18 to spend for lunch during a 5 day work week. It costs you about $1.50 to make lunch at home and about $5 to buy a lunch. How many times each work week should you make a lunch at home if you want to buy lunch as often as possible?

So the fit is 2 lunch at home and 3 lunch buy

Step-by-step explanation:

Let x represents for luch at home and y represents for lunch you buy

So, we can form an equation:

18 = 1.5x + 5y

To  find how many times each work week should you make a lunch at home if you want to buy lunch as often as possible, it means y always greater than x and they are whole numbers.

We need to create a table and use the test:

xyTotal cost

116.5

1211.5

2315

3424.5

So the fit is 2 lunch at home and 3 lunch buy

8(-10x+3.5y-7)

8×-10x + 8×3.5y + 8×-7

-80x + 28y - 56

therefore

-80x+28y-56 is the correct answer