document.write( "Question 914585: 7x+8y=25
\n" ); document.write( "9x+10y=35 using substitution or elimination \n" ); document.write( "

Algebra.Com's Answer #555212 by MathTherapy(10552) $\"\"$ $\"About$

You can put this solution on YOUR website!

\n" ); document.write( "7x+8y=25
\n" ); document.write( "9x+10y=35 using substitution or elimination
\n" ); document.write( "


\n" );
document.write( "7x +  8y = 25 ------- eq (i)
\n" );
document.write( "9x + 10y = 35 ------- eq (ii)
\n" );
document.write( "- 35x - 40y = - 125 ------- Multiplying eq (i) by - 5 ------ eq (iii)
\n" );
document.write( "  36x + 40y =   140 ------- Multiplying eq (ii) by 4 ------- eq (iv)
\n" );
document.write( "    x = 15 ------ Adding eqs (iii) & (iv)
\n" );
document.write( "Now substitute 15 for x in eq (i) or eq (ii), or any of the other equations to determine the value of y \n" );
document.write( "

\n" );