(a.) No, an x-value has more than one y-value.
(b.) Yes, an x-value has more than one y-value.
(c.) No, each x-value has one y-value.
(d.) Yes, each x-value has one y-value.
![a No an xvalue has more than one yvalue b Yes an xvalue has more than one yvalue c No each xvalue has one yvalue d Yes each xvalue has one yvalue class=](https://us-static.z-dn.net/files/d90/66794dce570780a05153a01431ebb077.png)