[tex]\begin{gathered} \text{Maya starts with 80, to that money we have to add the money she saves per week. } \\ \text{ since each week she saves \$10, in x weeks she saves 10x, and the equation is then } \\ y=80+10x \\ \\ \text{For Mariah we use a similar procedure! In x weeks she saves 5x, and Mariah's equation is} \\ y=100+5x \end{gathered}[/tex]