Which relation is a functions?

A

Step-by-step explanation:

What makes it a function?

If an x is unique but y can be duplicated

A is correct because the x are unique

B is incorrect because 3 is used twice

C is incorrect because -5 and -10 is used twice

D is incorrect because 20 is used twice

x=-2

infinite number of lines, so there is an infinite number of equations.

step-by-step explanation:

there are an infinite number of line that passes through the point (-2,5)

x=-2   is one line that passes through the point

y = 5 is another line that passes through the point

(these two lines are perpendicular to each other).

since the number of   numbers are infinite and the slope is the ratio of two numbers,(change in y over change in x) we can have an infinite number of slopes.     our only condition is that it passes through the point (-2,5)