A
B
C
D
Explanation
Correct answer: A.
Choice A is correct. In the xy-plane, the graph of an equation in the form , where and are constants, has a slope of and a y-intercept of . Therefore, the y-intercept of the graph of is .
Desmos solution:
Note: The y-intercept is the value of the function when x = 0, so typing f(0) into Desmos gives 81.
Enter in Desmos:
Reviewed and rewritten by CookSAT
Why the other choices are wrong
Choice B
Choice B is incorrect and may result from conceptual or calculation errors.
Choice C
Choice C is incorrect and may result from conceptual or calculation errors.
Choice D
Choice D is incorrect and may result from conceptual or calculation errors.