college algebra
posted by brianna mattson
If the average rate of change of g(x) from x = 7 to x = 10 is 80, and if g(7) = 400, then find g(10).

Katharine
g(10)=460

Katharine
using y=mx+b
m= 80
substitute the info given, g(7)=400
400 = 80(7) + b
b=960
substitute m & b into the equation;
g(x)= 80x + 960
substitute g(10) into the new equation
g(10)= 80(10)+960
g(10)= 160
SORRY, ABOUT THE LAST POST :) 
Reiny
So you have 2 points, (7,400) and (107) = 80
,y) where the slope = 80
(y400)/(107) = 80
y400 = 240
y = 160 , or g(10) = 240
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