1. 3rd one, because for each x there's only one y.
2. The domain are x's, so it's <span> {2, 4, 6, 8}
3. </span>The range are y's, so it's <span> {1, 2, 3, 4}
4.
5.</span>
6. <span>
7.
</span>
2. The domain are x's, so it's <span> {2, 4, 6, 8}
3. </span>The range are y's, so it's <span> {1, 2, 3, 4}
4.
5.</span>
6. <span>
7.
</span>
