sat suite question viewer
Two variables, and , are related such that for each increase of in the value of , the value of increases by a factor of . When , . Which equation represents this relationship?
Explanation
Choice D is correct. Since the value of increases by a constant factor, , for each increase of in the value of , the relationship between and is exponential. An exponential relationship between and can be represented by an equation of the form , where is the value of when and increases by a factor of for each increase of in the value of . Since when , . Since increases by a factor of for each increase of in the value of , . Substituting for and for in the equation yields . Thus, the equation represents the relationship between and .
Choice A is incorrect and may result from conceptual errors.
Choice B is incorrect. This equation represents a relationship where for each increase of in the value of , the value of increases by a factor of , not , and when , is equal to , not .
Choice C is incorrect and may result from conceptual errors.