Evaluate 5+x-5*8 for x = 7

In the xy-plane, if the parabola with equation passes through the point (-1, -1), which of the following must be true?

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

What is the slope of the line (-7,2) (4,6)