Question

Which of the following situations cannot be modeled with the equation 5x – 15y = 335? A. Randy earns $5 for each hour he works at his job, and spends $15 each time he goes out to dinner. He has $335 at the end of the week. B. A hamburger sells for $5 but costs $0.15 to make, giving a net income of $3.35. C. Ruby is paid for the 5 sales she made but docked for the 15 sales she missed for a net income of $335. D. Tommy earned points for 5 correct answers on a standardized test, but was docked for 15 incorrect answers for a point total of 335.

Answer 1

B. A hamburger sells for $5 but costs $0.15 to make, giving a net income of $3.35.

Explanation:

It's the right answer, for many wrong reasons:

- The units aren't the same... since the 5 is expressed in dollars and the the costs would be expressed in cents.

- There could only have one production cost per burger... so it's not a second variable.

- Of course, the calculation in the statement is also wrong ($5.00 - $0.15 doesn't equal $3.35)

So, for all these three reasons, that statement cannot be expressed in the given equation.