A firm has a linear cost function, where C(x) represents the total cost of producing x units of a good. We can expect this cost function to have a Select all answers that are correct. slope. constant positive negative increasing Question 12 Consider the following equation: y- 100-3x. Which of the following pairs of variables could be represented by this equation? O a person's height and weight O the outside temperature and ice cream sales O a person's salary and years on the job O driving speed and time to destination 4 pts