Question

Which graph represents y as a function of x?
Responses
A

Image without description
C
Graph with two lines starting from the same point on the y-axis and extending outwards in opposite diagonal directions. The grid has both x and y-axes marked, creating a coordinate plane.
Image with description Graph with two lines starting from the same point on the y-axis and extending outwards in opposite diagonal directions. The grid has both x and y-axes marked, creating a coordinate plane.
B
A coordinate plane with an open circle at point (-2, 0) and a solid vertical arrow extending upwards from this point. Another open circle is located at point (1, 0), with a solid vertical arrow extending downwards.
Image with description A coordinate plane with an open circle at point (-2, 0) and a solid vertical arrow extending upwards from this point. Another open circle is located at point (1, 0), with a solid vertical arrow extending downwards.
D

Image without description

Answer 1

C.

The "V" graph in C passes the vertical line test (each x corresponds to exactly one y). B fails (vertical rays give many y-values for the same x), and the other graphs do not represent y as a function.