Question 1146712: Tim buys a new computer for $1200. After four years, he sells the computer to a friend for $450. Let y represent the current value of the computer, and x represent the number of years. Write a linear equation in slope-intercept form to model the value of the computer over time.
Answer by ankor@dixie-net.com(22740)   (Show Source):
You can put this solution on YOUR website! Tim buys a new computer for $1200.
After four years, he sells the computer to a friend for $450.
Let y represent the current value of the computer, and x represent the number of years.
Write a linear equation in slope-intercept form to model the value of the computer over time.
:
y = mx + b
y = 1200, when x (time) is 0, therefore b = 1200
when x=4, y=450, find m
4m + 1200 = 450
4m = 450 - 1200
m = -750/4
m = -187.5
the equation
y = -187.5x + 1200
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