help me plz
Which relation is a function? (Points : 4) {(1, 2); (2, 3); (3, 4); (1, 5)} {(1, 2); (2, 5); (3, 2); (4, 5)} {(1, 2); (2, 3); (3, 4); (2, 5)} {(1, 2); (1, 3); (3, 2); (4, 2)}

Question

help me plz
Which relation is a function? (Points : 4) {(1, 2); (2, 3); (3, 4); (1, 5)} {(1, 2); (2, 5); (3, 2); (4, 5)} {(1, 2); (2, 3); (3, 4); (2, 5)} {(1, 2); (1, 3); (3, 2); (4, 2)}

anonymous · Answer

The 2nd one.

anonymous · Answer

i have some more can you help? @konrad509

anonymous · Answer

If I remember this the right way, I think you do the vertical line test. You plot them accordingly (x,y) and draw/imagine a vertical line and if there's more than 1 dot on the line, it isn't a function. So, if you list the domain and range, and they each match up with the other, it's a function.

anonymous · Answer

or @365-days-of-april