For this case we have that by definition:
- The terms of a polynomial expression are those that are composed of coefficients and variables separated by signs of addition and subtraction.
We then have the following expression:
![-6xyz + 9xy + 12x + 18y](https://img.qammunity.org/2020/formulas/mathematics/high-school/6mhf56qyskthilux4ni2weczbja6s5nwhv.png)
According to the definition, we can conclude that the first term is given by:
![-6xyz](https://img.qammunity.org/2020/formulas/mathematics/high-school/w5e3ucxn3brlf7iiql1g54u0naagc118ev.png)
Answer:
The first term of the expression is:
![-6xyz](https://img.qammunity.org/2020/formulas/mathematics/high-school/w5e3ucxn3brlf7iiql1g54u0naagc118ev.png)