SOLUTION: at sea level the boiling point of water is 100 degrees celsius. At altitude of 7 km, the boiling point of water is 75.5 degrees celsius. Write a linear function of the boiling poin

Algebra ->  Linear-equations -> SOLUTION: at sea level the boiling point of water is 100 degrees celsius. At altitude of 7 km, the boiling point of water is 75.5 degrees celsius. Write a linear function of the boiling poin      Log On


   



Question 1155601: at sea level the boiling point of water is 100 degrees celsius. At altitude of 7 km, the boiling point of water is 75.5 degrees celsius. Write a linear function of the boiling point of water y in terms of the altitude above sea level x.
Found 2 solutions by josgarithmetic, josmiceli:
Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
Points (x,y); (x)Altitude, (y)Temperature to boil

Described points are (0, 100) and (7, 75.5).
Determine the equation (linear) from those two points.

Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
You are given the points:
( 0, 100 )
( 7, 75.5 )
Use the general point-slope formula
+%28+y+-+100+%29+%2F+%28+x+-+0+%29+=+%28+75.5+-+100+%29+%2F+%28+7+-+0+%29+
+%28+y+-+100+%29+%2F+%28+x+-+0+%29+=+-24.5+%2F+7+
+%28+y+-+100+%29+%2F+x+=+-3.5+
+y+-+100+=+-3.5x+
+y+=+-3.5x+%2B+100+
---------------------------
check:
( 0,100 )
+100+=+-3.5%2A0+%2B+100+
+100+=+100+
and
( 7, 75.5 )
+75.5+=+-3.5%2A7+%2B+100+
+75.5+=+-24.5+%2B+100+
+75.5+=+75.5+
OK