Question

Alex is saving money because she would like to purchase the new video gaming system that everyone has been talking about. After two weeks of saving she had $47. After 24 weeks of saving she had $430. Approximately how many dollars per week did alex save on average between weeks 2 and 4?

Answer 1

Find the slope of the line connecting the points (2, $47) and (24, $430):

$430 - $47
m = ------------------ = $17.41
24 - 2

She saved roughly $17.41 each week between weeks 2 and 24; she saved the same each week between weeks 2 and 4.