Triangle Inequalities part 2 help please

Answer:
The perimeter can not be 26 inches
Step-by-step explanation:
Given
[tex]Side\ 1 =19[/tex]
[tex]Side\ 2 =16[/tex]
Required
Is a perimeter of 26 possible?
First, calculate the possible side 3
[tex]Side\ 3 = Perimeter - Side\ 1 - Side\ 2[/tex]
[tex]Side\ 3 = 26 - 16 - 19[/tex]
[tex]Side\ 3 = -9[/tex]
The side length can not be negative.
So, the perimeter can not 26 inches