Maria is saving money to buy a bike that cost 133$. She has 42$ and will save an additional 7 each w

Maria is saving money to buy a bike that cost 133$. She has 42$ and will save an additional 7 each week.

Set up an equation with w as the number of weeks. We want to find w such that:
7w + 42 = 133

Typing this equation into our search engine, we get:
w = 13