document.write( "Question 167543: solve by elimination method:
\n" ); document.write( "0.3x-0.2y=4
\n" ); document.write( "0.4x+0.3y=73/19 \n" ); document.write( "

Algebra.Com's Answer #123438 by aswathytony(47) $\"\"$ $\"About$

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0.3x -0.2y =4 ...........(1)\r
\n" ); document.write( "\n" ); document.write( "0.4 x + 0.3 y = 73/19 ...........(2)\r
\n" ); document.write( "\n" ); document.write( "(1) * 0.3 & (2) * 0.2\r
\n" ); document.write( "\n" ); document.write( " 0.3 x * 0.3 - 0.2y * 0.3 = 4 *0.3
\n" ); document.write( " 0.09x -0.06y = 1.2 .............(3)\r
\n" ); document.write( "\n" ); document.write( " 0.4x * 0.2 + 0.3 y * 0.2 = 73/19 * 0.2 \r
\n" ); document.write( "\n" ); document.write( " 0.08x + 0.06 y = 0.768 ..........(4)\r
\n" ); document.write( "\n" ); document.write( "(3) + (4)\r
\n" ); document.write( "\n" ); document.write( " 0.17x = 1.968\r
\n" ); document.write( "\n" ); document.write( " x = 1.968/0.17= 11.58\r
\n" ); document.write( "\n" ); document.write( "substituting x = 11.58 in (1)\r
\n" ); document.write( "\n" ); document.write( " 0. 3 * 11.58 -0.2 y = 4
\n" ); document.write( " 3.474 -0.2y = 4
\n" ); document.write( " - 0.2y = 4 - 3.474
\n" ); document.write( " - 0.2 y = 0.526
\n" ); document.write( " y = 0.526 / -0.2
\n" ); document.write( " = -2.63 \n" ); document.write( "

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