Answer:
Negative linear relation
Step-by-step explanation:
When one variable increases (the price) while the other variable decreases (the number of hamburgers he sells) , a negative linear relationship exists.
The photo below may help you.
First you would make the mixed fractions into improper fraction by multiplying the denominator and the whole number, then adding the numerator. Then you would flip the second fraction and multiply.
Ex. 1 1/2 ÷1 1/2
1st. 3/2÷3/2
2nd: 3/2×2/3
3rd 3/2x2/3=1