At week 0, she starts at $50, and deposits $20 in succedding weeks. Let x be the number of weeks, the equation is therefore
[tex]y=20x+50[/tex]After 3 weeks, she will have
[tex]\begin{gathered} x=3 \\ \text{substitute it to the equation and we have:} \\ y=20x+50 \\ y=20(3)+50 \\ y=60+50 \\ y=110 \end{gathered}[/tex]Therefore, the point in the line would be (3,110).
