SOLUTION: In 1955, a collectors coin cost $45. Thirty years later, the coin valued $180. What was the average yearly increase in the coins value?

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Question 830746: In 1955, a collectors coin cost $45. Thirty years later, the coin valued $180. What was the average yearly increase in the coins value?
Answer by TimothyLamb(4379) About Me  (Show Source):
You can put this solution on YOUR website!
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given:
1955, 45
1985, 180
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to solve the linear equation, copy and paste this (the two given points):
1955, 45, 1985, 180
into the "Two-Point form: x1 y1 x2 y2" input box here: https://sooeet.com/math/linear-equation-solver.php
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x-intercept = (1945, 0)
y-intercept = (0, -8752.5)
slope = 4.5
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the linear model:
v(t) = 4.5t - 8752.5
where:
t = years
v = coin value (dollars)
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answer:
the average yearly increase in value is the slope of the linear model = $4.50
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