why is -4 a rational number

Question

I need to know why -4 is a rational I am very confused. I am doing my homework and have been stuck on this question the whole time I thought that it would be a intger.

edit:thanks for the help

Answer 1

A number is rational if it can be expressed as the ratio of two integers, which $-4$ can: $\frac{-4}{1}$. It is also an integer; the set of integers is a subset of the set of rational numbers.

Answer 2

The set of all integers are in the set of rationals. Just like how the set of all naturals are in set of integers.

Answer 3

$-4 = \frac{-4}{1}$, that is to say, it can be represented as a ratio in the form $\frac{a}{b}$ where $b \ne 0$ and $a$ and $b$ are integers. This is the definition of a rational number.

$-4$ is also an integer, and integers are a subset of rational numbers.