Answer:
R/ Eighth more than twice a number.
Explanation:
We have several expressions and we need to establish which of them will be linear functions.
1- Eighth more than twice a number. it means 8+2x. Linear function.
2- Three more than the product of two numbers: 3 + x*y. Product of two linear variables.
3- Ten more than the square of a number: 10 + x*x. Quadratic function.
4- Nine more than one divided by a number: 9 + 1/x. Inverse function.
As we can see only options 1 and 2 could be linear. However, the product of two linear variables is not linear, is quadratic.
Finally, We can conclude that the only description which can be written as a linear function is: Eighth more than twice a number.