sat suite question viewer
| hh | f(h)f(h) |
|---|---|
| 11 | 155155 |
| 33 | 285285 |
The table gives the number of hours, , of labor and a plumber’s total charge , in dollars, for two different jobs.
There is a linear relationship between and . Which equation represents this relationship?
Explanation
Choice C is correct. It's given that there is a linear relationship between a plumber's hours of labor, , and the plumber's total charge , in dollars. It follows that the relationship can be represented by an equation of the form , where is the rate of change of the function and is a constant. The rate of change of can be calculated by dividing the difference in two values of by the difference in the corresponding values of . Based on the values given in the table, the rate of change of is , or . Substituting for in the equation yields . The value of can be found by substituting any value of and its corresponding value of for and , respectively, in this equation. Substituting for and for yields , or . Subtracting from both sides of this equation yields . Substituting for in the equation yields .
Choice A is incorrect and may result from conceptual or calculation errors.
Choice B is incorrect and may result from conceptual or calculation errors.
Choice D is incorrect and may result from conceptual or calculation errors.