Suppose that z varies directly with x and inversely with y. When x=6, y=2 and z=15, find the value of z when x=4 and y=9. Answer the following:
A) constant variation. K=___

B) Write a function rule (equation) that models the variation. Z=___

C) z=___

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