document.write( "Question 107809: solve the system by substitution:\r
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Algebra.Com's Answer #78594 by scott8148(6628)\"\" \"About 
You can put this solution on YOUR website!
substituting the value of y from the second equation into the first equation gives 4x-4(2x-5)=0\r
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\n" ); document.write( "\n" ); document.write( "4x-8x+20=0 ... 20=4x
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