Define a variable and write an equation for each real-world problem. 1] matt spent $ 6.50 on his lunch. this is $2.25 more than his friend jackson spent on his lunch. how much did jackson spend on his lunch?

The customer price index(cpi), which measures the cost of a typical package of customer goods,was 208.8 in 2011 and 244.1 in 2016.let x=11 corresponding to the year 2011 an estimate to cpi into 2013 and 2014. assume that the data can be modeled by a straight line and the trend to continue idenfinitely.use data points to find such a line and then estimate the requested quantities