Subtract. -8- 21= would -13 be the answer

Which expression can be used to determine the slope of the line that passes through the points -6, three and one, -9

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

Is (0,0) a to ? ys x2 - 4 y> 2x-1