SOLUTION: in 2009, the number of students in a large urban high school was 2370. in 2011, the number of students was 2340. if the number of students declines linearly, find the equation that

Algebra ->  Linear-equations -> SOLUTION: in 2009, the number of students in a large urban high school was 2370. in 2011, the number of students was 2340. if the number of students declines linearly, find the equation that      Log On


   

Question 1123170: in 2009, the number of students in a large urban high school was 2370. in 2011, the number of students was 2340. if the number of students declines linearly, find the equation that represents this relationship. assume x is the year and y is the number of students. then use this equation to predict the number of students in 2015
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
You are given points:
( 0, 2370 )
( 2, 2340 )
I am calling year 2009 year 0
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Use the general point-slope formula
+%28+y+-+2370+%29+%2F+%28+x+-+0+%29+=+%28+2340+-+2370+%29+%2F+%28+2+-+0+%29+
+%28+y+-+2370+%29+%2F+x+=+-30+%2F+2+
+y+-+2370+=+-15x+
+y+=+-15x+%2B+2370+
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2015 - 2009 = 6
+y+=+-15%2A6+%2B+2370+
+y+=+2280+ students in 2015