system of equations

[desa]

The sum of four time the sales of IPos from 2004 and the sales of IPods from 2005 was 40161000 IPods. The difference of 2005 and 2004 sales was 18081000 IPods. If Apple IPods sales between 2004 and 2005 is an increasing function find 2004 and 2005 sales of Ipods.

how do you work this problem????

 

[skeeter]

let x = sales for 2004
y = sales for 2005
you were also told that y > x

The sum of four time the sales of IPos from 2004 and the sales of IPods from 2005 was 40161000 IPods.

write an equation for this statement

The difference of 2005 and 2004 sales was 18081000 IPods.

write an equation for this statement

once you get the two equations, solve the system of equations by whatever method(s) you were taught in class.