document.write( "Question 551418: -3x + 4y= 8
\n" ); document.write( "x +2y =10 \n" ); document.write( "
Algebra.Com's Answer #359722 by oberobic(2304)\"\" \"About 
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-3x + 4y = 8
\n" ); document.write( "x + 2y = 10
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\n" ); document.write( "Multiply the second equation by 2 and then subtract the second equation to eliminate the 'y' term.
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\n" ); document.write( "-3x +4y = 8
\n" ); document.write( "2x + 4y = 20
\n" ); document.write( "------------- subtract
\n" ); document.write( "-5x = -12
\n" ); document.write( "x = -12/-5 = 12/5
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\n" ); document.write( "Now substitute to find 'y' using the first equation.
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\n" ); document.write( "-3*(12/5) + 4*y = 8
\n" ); document.write( "4y = 8 +36/5 = 40/5 + 36/5 = 76/5
\n" ); document.write( "y = 19/5
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\n" ); document.write( "Check these values using the second equation to be sure this is the answer.
\n" ); document.write( "(12/5) + 2*(19/5) = 10
\n" ); document.write( "12/5 + 38/5 = 50/5 = 10
\n" ); document.write( "Correct.
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\n" ); document.write( "Answer: x = 12/5, y = 19/5, which can be shown as the ordered point (12/5, 19/5).
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\n" ); document.write( "Done.
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