document.write( "Question 386322: I need help to show me how to work out the use the substitution to solve the equations and state if it has no solution or infinitely many solutions: 2x+7y=3 x=1-4y \n" ); document.write( "
Algebra.Com's Answer #273106 by stanbon(75887)\"\" \"About 
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I need help to show me how to work out the use the substitution to solve the equations and state if it has no solution or infinitely many solutions: 2x+7y=3 x=1-4y
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\n" ); document.write( "Substitute for \"x\" and solve for \"y\":
\n" ); document.write( "2(1-4y) + 7y = 3
\n" ); document.write( "-------
\n" ); document.write( "2 - 8y + 7y = 3
\n" ); document.write( "2 -y = 3
\n" ); document.write( "y = 2-3
\n" ); document.write( "y = -1
\n" ); document.write( "-----
\n" ); document.write( "Since x = 1-4y, solve for \"x\":
\n" ); document.write( "x = 1-4*(-1)
\n" ); document.write( "x = 5
\n" ); document.write( "-----
\n" ); document.write( "Check the answer:
\n" ); document.write( "2x+7y=3
\n" ); document.write( "2(5)+7(-1) = 3
\n" ); document.write( "10-7 = 3
\n" ); document.write( "3 = 3
\n" ); document.write( "==============
\n" ); document.write( "Solution: (5,-1)
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H. \n" ); document.write( "
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