document.write( "Question 774573: need help with 4x-y =100 and 0.05x-o.06y=-32 using the substitution method \n" ); document.write( "
Algebra.Com's Answer #472430 by ankor@dixie-net.com(22740)\"\" \"About 
You can put this solution on YOUR website!
4x-y =100 and 0.05x-o.06y=-32 using the substitution
\n" ); document.write( "rearrange the 1st equation
\n" ); document.write( "4x - y = 100
\n" ); document.write( "-y = -4x + 100
\n" ); document.write( "multiply
\n" ); document.write( "y = 4x - 100
\n" ); document.write( ":
\n" ); document.write( ".05x - .06y = -32
\n" ); document.write( "multiply by 100 to get rid of those annoying decimals
\n" ); document.write( "5x - 6y = -3200
\n" ); document.write( "substitute (4x-100) for y
\n" ); document.write( "5x - 6(4x-100) = -3200
\n" ); document.write( "5x - 24x + 600 = -3200
\n" ); document.write( "-19x = -3200 - 600
\n" ); document.write( "-19x = -3800
\n" ); document.write( "x = -3800/-19
\n" ); document.write( "x = +200
\n" ); document.write( ":
\n" ); document.write( "Find y
\n" ); document.write( "y = 4x - 100
\n" ); document.write( "y = 4(200) - 100
\n" ); document.write( "y = 700
\n" ); document.write( ":
\n" ); document.write( "I'll let you check the solutions; x-200, y=700 in both original equations \n" ); document.write( "
\n" );