sat suite question viewer
For the linear function , and . Which equation defines ?
Explanation
Choice C is correct. An equation defining the linear function can be written in the form , where is the slope and is the y-intercept of the graph of in the xy-plane. The slope of the graph of can be found using the formula , where and are any two points that the graph passes through. If , it follows that the graph of passes through the point . If , it follows that the graph of passes through the point . Substituting and for and , respectively, in the formula yields , which is equivalent to , or . Since the graph of passes through , it follows that . Substituting for and for in the equation yields , or . Thus, the equation that defines is .
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.