document.write( "Question 3392: How do you solve when decimals are involved?\r
\n" ); document.write( "\n" ); document.write( "3x-2.5y=7.125
\n" ); document.write( "2.5x-3y=7.3125 \n" ); document.write( "

Algebra.Com's Answer #1503 by gsmani_iyer(201) $\"\"$ $\"About$

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\n" ); document.write( " 3x - 2.5y = 7.125 .... (1)
\n" ); document.write( " 2.5x - 3y = 7.3125 .... (2)
\n" ); document.write( "by multiplying eq.(1) by 2.5, we get
\n" ); document.write( " 7.5x - 6.25y = 17.8125 ... (3)
\n" ); document.write( "similarly eq.(2)*3, we get
\n" ); document.write( " 7.5x - 9y = 21.9375 .... (4)
\n" ); document.write( "now, eq.(4)-(3), we get
\n" ); document.write( " -2.75y = 4.125
\n" ); document.write( "So y = $\"4.125%2F-2.75\"$ = -1.5
\n" ); document.write( "replacing the value of this y in eq.(1)
\n" ); document.write( " 3x - $\"2.5%2A%28-1.5%29\"$ = 7.125
\n" ); document.write( "= 3x - (-3.75) = 7.125
\n" ); document.write( "= 3x + 3.75 = 7.125
\n" ); document.write( "= 3x = 7.125 - 3.75 = 3.375
\n" ); document.write( "So x = $\"3.375%2F3\"$ = 1.125\r
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\n" ); document.write( "\n" ); document.write( "x = 1.125; y = -1.5 Answer.\r
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\n" ); document.write( "\n" ); document.write( "gsm\r
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