document.write( "Question 104891: Please help me find the equation of this function problem: Assume that it costs $0.30 to mail a letter weighing one ounce or less, and then $0.27 for each additional ounce or fraction of an ounce. Let L(x)be the cost of mailing a letter weighing x ounces. Find L(4). \n" ); document.write( "

Algebra.Com's Answer #76327 by oberobic(2304) $\"\"$ $\"About$

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Think of this as a linear equation.
\n" ); document.write( "y = mx + b is the general equation for a line.
\n" ); document.write( "We're told that for each ounce after the first ounce, the charge is 27 cents. That is the slope (m).
\n" ); document.write( "We're told the first oz costs 30 cents = 27+3.
\n" ); document.write( "y = 27x + 3
\n" ); document.write( "Checking at x = 1,
\n" ); document.write( "y = 27+3 = 30.
\n" ); document.write( "Checking at x = 2,
\n" ); document.write( "y = 27*2 + 3 = 54 + 3 = 57.
\n" ); document.write( "That fits the facts given.
\n" ); document.write( "So, apply for 4 oz:
\n" ); document.write( "y = 27*4 + 3 = 108+3 = 111 cents = $1.11. \n" ); document.write( "

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