document.write( "Question 1167930: A pencil and eraser cost total of 15 naira. What is the cost of 60 erasers. If one pencil cost 5 naira? \n" ); document.write( "

Algebra.Com's Answer #792516 by Theo(13342) $\"\"$ $\"About$

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let p equal the cost of one pencil.
\n" ); document.write( "let e equal the cost of one eraser.\r
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\n" ); document.write( "\n" ); document.write( "your equation is p + e = 15\r
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\n" ); document.write( "\n" ); document.write( "if the cost of 1 pencil is 5 naira, then:\r
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\n" ); document.write( "\n" ); document.write( "p + e = 15 becomes 5 + e = 15\r
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\n" ); document.write( "\n" ); document.write( "start with:
\n" ); document.write( "5 + e = 15
\n" ); document.write( "subtract 5 from both sides of the equation to get:
\n" ); document.write( "e = 15 - 5
\n" ); document.write( "combine like terms to get:
\n" ); document.write( "e = 10\r
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\n" ); document.write( "\n" ); document.write( "that's the price of 1 eraser.\r
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\n" ); document.write( "\n" ); document.write( "when 60 erasers are bought, ....\r
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\n" ); document.write( "\n" ); document.write( "cost = 60 * 10\r
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\n" ); document.write( "\n" ); document.write( "solve for cost to get:\r
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\n" ); document.write( "\n" ); document.write( "cost = 600 naira.\r
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