No, it fails the vertical line test.
If you take your pencil or your finger and hold it upright, parallel to the y axis, and move it from left to right your pencil or finger will thought the line in multiple places at the same time. This is the vertical line test and because it hits multiple places on the line at the same time it fails the test. This is telling you that an x value has more than one y value, so it is not a function.
