Find a set of ordered pairs(x, y) that represents...a? or c?

[RicanGurl]

Find a set of ordered pairs (x, y) that represents y as a function of x.

a) {(-1, -2), (-2, -1), (0,0)}

b) {(-1, -2), (-2, -3), (-1, 0)}

c) {(-1,-2), (-3,0), (-3, -1), (0, -3)}

d) {-1,-2,-3,0}

My friends keep leaning to C, but I' m leaning to A what do you think?

 

[jwpaine]

Re: Find a set of ordered pairs(x, y) that represents...a? o

Find a set of ordered pairs (x, y) that represents y as a function of x.

a) {(-1, -2), (-2, -1), (0,0)}



b) {(-1, -2), (-2, -3), (-1, 0)}


c) {(-1,-2), (-3,0), (-3, -1), (0, -3)}


d) {-1,-2,-3,0}


My friends keep leaning to C, but I' m leaning to A what do you think?

A function associates to each element in the set X (an input) exactly one element in the set Y (the output).

Does this help you make your decision? Draw a bubble for both a and c, and connect each element in x with it's element in y... you should be able to see which one is a function and which one is not. You cannot have one x value going to more than one y value.

John

 

[RicanGurl]

Yes

theres only one x and one for y, so that means that its A, right?

because their are no repeated numbers under either x or y

 

[jwpaine]

Re: Yes

theres only one x and one for y, so that means that its A, right?

because their are no repeated numbers under either x or y

A is the correct answer, because if you look at c, x = -3 corresponds to more than one y value there for c is not a function.

John

 

[stapel]

My friends keep leaning to C, but I' m leaning to A what do you think?

I think you might be sure of your answer if you went through the reasoning. Why do you think that "A" is the correct answer? What rules and/or definition have you applied? And so forth. :?:

Please be specific. Thank you!

Eliz.