## Tuesday, October 5, 2010

### Apply Linear Equation in two Variables

I'm doing Example 8 from page 38 Chapter P.4 and it asks me to find the Linear Model for Americans' Personal incomes.
On question (A) i use the point that were given (x1, y1), (x2, y2) ..(1998, 7.4), (1999, 7.8) I used the formula to find for the slope which is (y2-y1 over x2-x1) Then after i got the slope i find the y-intercept by pluging the slope and point (1998, 7.4) into the equation of the slope-intercept form. Then i got this equation (y=0.4x-791.8) in the form of (y=mx+b)
Then, on (B) i just plug (2001) in to the equation to find the income of American in the year of 2001.
On (C) , it's basically the same as (b) but in a different year. I used the year of 2007 on that one.
(D) Is where a graph is shown from 1998-2006 (The American Income)
(E) Ask me that what may have happened that from 2000-2007 that can effect the income. I said that WAR can dicrease the American Income because it causes loss of jobs as well as homeless.