The line graph shows the amount of money Luis spent from July to December.

1. Of the amount Luis spent in October, $173 was spent on food and the remaining amount was spent on clothes. How much did he spend on clothes in October?
2. In which month did Luis spend $100 less than the previous month? Give your answer in this format. (Eg Jan)

(a)
Amount that Luis spent in October = $380

Amount that Luis spent on clothes
= 380 - 173
= $207

(b)
To find a decrease in a line graph, look for a decreasing slope. 

The 2 decreasing slopes are from July to August and October to November. Now, find the month when Luis spent $100 less than the previous month.

Amount that Luis spent in July = $120
Amount that Luis spent in August = $20

Amount that Luis spent in August less than July
= 120 - 20
= $100 (✓)

Amount that Luis spent in October = $380
Amount that Luis spent in November = $280

Amount that Luis spent in November less than October
= 380 - 280
= $100 (x)

The month that Luis spent $100 more than the previous month = Aug

Answer(s): (a) $207; (b) Aug