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a+2b=11
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document.write( "multiply the second equation by 2.when you multiply an equation by a number,the equation still remains the same,because you could divide that and get the original equation back again
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document.write( "now we have
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document.write( "a+2b=11
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document.write( "2a-2b=10
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document.write( "Add the two equations,
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document.write( "(a+2b+2a-2b)=11+10
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document.write( "3a=21
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document.write( "a=7
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document.write( "From equation 1,
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document.write( "a+2b=11
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document.write( "2b=11-a
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document.write( "2b=11-7
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document.write( "2b=4
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document.write( "b=2
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document.write( "a=7,b=2
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document.write( "-Prabhat