[tex]2x+3=19[/tex]
1) Considering that we can call t-shirts "x" then we can write out the following equations to express this problem:
Robert: 2x +3
Brianne: x
2) Now, we can write out the following equation to find out how many t-shirts does Brianne have:
[tex]\begin{gathered} 2x+3=19 \\ 2x+3-3=19-3 \\ 2x=16 \\ \frac{2x}{2}=\frac{16}{2} \\ x=8 \end{gathered}[/tex]
So that's the number of t-shirts Brianne has. And the equation used is:
[tex]2x+3=19[/tex]
