Answer:
The system has infinite solutions
Explanation:
For a system of two linear equations it is always true that if one equation is a linear combination of another, then the system will have infinite solutions.
Suppose we have the following system:
![ax + by = c\\dx + hy = f](https://img.qammunity.org/2020/formulas/mathematics/high-school/dzpr7e8dw0k5zj2o6vuees1mu7rhx7altf.png)
If there is a number n for which it is fulfilled that
![<a, b, c> = n * <d, h, f>](https://img.qammunity.org/2020/formulas/mathematics/high-school/eezxkguwglpinuuocpel0uy52lesqqwg8f.png)
Then the system has infinite solutions.
In this case the system is:
![x + 2y=10\\3x+6y =30](https://img.qammunity.org/2020/formulas/mathematics/high-school/pbu08tbmw9s9jesfyq697bdha5uuh994mo.png)
Observe that:
![<1, 2, 10> = (1)/(3)* <3, 6, 30>](https://img.qammunity.org/2020/formulas/mathematics/high-school/b3drkaa7j53wvw5gfjm1i6tk1hst0c5xql.png)
Then
![n =(1)/(3)](https://img.qammunity.org/2020/formulas/mathematics/high-school/l2xz07zul12a5se20ymy1qjbfaw1sng85d.png)
The system has infinite solutions