[tex]\text{We know that it's a proportional relationship,. so she is }\\\text{saving money at a constant rate}\\\\\text{This means that our equation has to be linear}\\\\\text{We know that she saves \$30 per month}\\\\\text{Lets represent x as months and y as total amount saved:}\\\\y=30x\\\\\text{Our equation would be y =30x, since it'll allow us to calculate how much}\\\text{she saved during a certain amount of months}\\\\\boxed{y=30x}[/tex]
