Find the domain and range.
-{(3,4), (-8,-6), (9,3), (9,9)}
A)domain = {3, -8, 9, -9}; range = {4, -6, 3, 9}
B)domain = {3, -8, 9}; range = {4, -6, 3, 9}
C)domain = {3, -8, 9, 19}; range = {4, -6, 3, 9}
D)domain = {4, -6, 3, 9}; range = {3, -8, 9}

Question

Quizplus · Accepted Answer

The domain includes the x-coordinates of each point, which are 3, -8, and 9. The range includes the y-coordinates, which are 4, -6, 3, and 9. Therefore, the correct choice is B. Choice A is incorrect because it includes an extra number, -9, that is not in the domain. Choice C is incorrect because it includes the number 19, which is not in the domain. Choice D is incorrect because it switches the domain and range. The domain is the set of all x-coordinates of the given points, which are 3, -8, and 9. The range is the set of all y-coordinates of the given points, which are 4, -6, 3, and 9. Therefore, the best choice is B, which includes the correct domain and range. Option A includes -9 in the domain, which is not part of any of the given points. Option C includes 19 in the domain, which is not given in any of the x-coordinates. Option D includes 4 in the domain, which is also not part of any given x-coordinate.

Find the Domain and Range