document.write( "Question 928038: how do I solve x+3y=6 and 2x+3y=18 by the substitution method \n" ); document.write( "

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\n" ); document.write( "how do I solve x+3y=6 and 2x+3y=18 by the substitution method
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document.write( " x + 3y =  6_______x = 6 - 3y ------- eq (i)
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document.write( "2x + 3y = 18 ------ eq (ii)
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document.write( "2(6 - 3y) + 3y = 18 ------- Substituting 6 - 3y for x in eq (ii)
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document.write( "12 - 6y + 3y = 18
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document.write( "- 6y + 3y = 18 - 12
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document.write( "- 3y = 6
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document.write( ", or \r
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document.write( "x + 3(- 2) = 6 ------ Substituting - 2 for y in eq (i)
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document.write( "x - 6 = 6
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document.write( "x = 6 + 6, or        
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document.write( "You can do the check!! 
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