document.write( "Question 1008286: May I have help w/ this one?\r
\n" ); document.write( "\n" ); document.write( "1)
\n" ); document.write( "3r +5s + t =0
\n" ); document.write( "3r –s –3t = 4
\n" ); document.write( "-3r-4s-4t= -19\r
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "

Algebra.Com's Answer #624054 by MathTherapy(10552) $\"\"$ $\"About$

You can put this solution on YOUR website!
May I have help w/ this one?\r
\n" ); document.write( "\n" ); document.write( "1)
\n" ); document.write( "3r +5s + t =0
\n" ); document.write( "3r –s –3t = 4
\n" ); document.write( "-3r-4s-4t= -19
\n" ); document.write( "

  3r + 5s + t = 0 -------- eq (i)
\n" );
document.write( "  3r – s – 3t = 4 -------- eq (ii)
\n" );
document.write( "- 3r - 4s - 4t = - 19 ---- eq (iii)\r
\n" );
document.write( "\n" );
document.write( "   s - 3t = - 19 ----- Adding eqs (i) & (iii) ------- eq (iv)
\n" );
document.write( "- 5s - 7t = - 15 ----- Adding eqs (ii) & (iii) ------ eq (v)
\n" );
document.write( "  5s - 15t = - 95 ---- Multiplying eq (iv) by 5 ----- eq (vi)
\n" );
document.write( "     - 22t = - 110 --- Adding eqs (v) & (vi)
\n" );
document.write( ", or \r
\n" );
document.write( "\n" );
document.write( "s - 3(5) = - 19 ---------- Substituting 5 for t in eq (iv)
\n" );
document.write( "s - 15 = - 19
\n" );
document.write( "s = - 19 + 15, or \r
\n" );
document.write( "\n" );
document.write( "3r + 5(- 4) + 5 = 0 ------ Substituting - 4 for s, and 5 for t in eq (i)
\n" );
document.write( "3r - 20 + 5 = 0
\n" );
document.write( "3r - 15 = 0
\n" );
document.write( "3r = 15
\n" );
document.write( "r = , or  \n" );
document.write( "

\n" );