document.write( "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? \n" ); document.write( "
Algebra.Com's Answer #500897 by TimothyLamb(4379)\"\" \"About 
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\n" ); document.write( "given:
\n" ); document.write( "1955, 45
\n" ); document.write( "1985, 180
\n" ); document.write( "---
\n" ); document.write( "to solve the linear equation, copy and paste this (the two given points):
\n" ); document.write( "1955, 45, 1985, 180
\n" ); document.write( "into the \"Two-Point form: x1 y1 x2 y2\" input box here: https://sooeet.com/math/linear-equation-solver.php
\n" ); document.write( "---
\n" ); document.write( "x-intercept = (1945, 0)
\n" ); document.write( "y-intercept = (0, -8752.5)
\n" ); document.write( "slope = 4.5
\n" ); document.write( "---
\n" ); document.write( "the linear model:
\n" ); document.write( "v(t) = 4.5t - 8752.5
\n" ); document.write( "where:
\n" ); document.write( "t = years
\n" ); document.write( "v = coin value (dollars)
\n" ); document.write( "---
\n" ); document.write( "answer:
\n" ); document.write( "the average yearly increase in value is the slope of the linear model = $4.50
\n" ); document.write( "---
\n" ); document.write( "Solve and graph linear equations:
\n" ); document.write( "https://sooeet.com/math/linear-equation-solver.php
\n" ); document.write( "---
\n" ); document.write( "Solve quadratic equations, quadratic formula:
\n" ); document.write( "https://sooeet.com/math/quadratic-formula-solver.php
\n" ); document.write( "---
\n" ); document.write( "Solve systems of linear equations up to 6-equations 6-variables:
\n" ); document.write( "https://sooeet.com/math/system-of-linear-equations-solver.php \n" ); document.write( "
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