When we have a negative sign in front of a number, the sign of the number is changed, therefore if the number is negative the number will turn positive. This is done below:
[tex]\begin{gathered} (-4)\text{ - (-5)} \\ (-4)\text{ + 5} \end{gathered}[/tex]
When we sum two numbers of different signs, we subtract their values and maintain the sign of the greatest one:
[tex]-4\text{ + 5 = 1}[/tex]
