document.write( "Question 1157002: 1. Solve the system by substitution.
\n" ); document.write( " A) 3x+4y=11. B) 3x+2y=6
\n" ); document.write( " -8x-y=19. 2x+5y=-7\r
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\n" ); document.write( "\n" ); document.write( "2. Solve the system using the addition method
\n" ); document.write( " A)11x-5y=10. B)10x-4y=7
\n" ); document.write( " 13x-7y=2. B)4x-y=-5\r
\n" ); document.write( "\n" ); document.write( "I need to show the work and I don't understand how to do them. \n" ); document.write( "

Algebra.Com's Answer #779801 by MathTherapy(10552) $\"\"$ $\"About$

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\n" ); document.write( "1. Solve the system by substitution.
\n" ); document.write( " A) 3x+4y=11. B) 3x+2y=6
\n" ); document.write( " -8x-y=19. 2x+5y=-7\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "2. Solve the system using the addition method
\n" ); document.write( " A)11x-5y=10. B)10x-4y=7
\n" ); document.write( " 13x-7y=2. B)4x-y=-5\r
\n" ); document.write( "\n" ); document.write( "I need to show the work and I don't understand how to do them.
\n" ); document.write( "

This is how B) needs to be done:
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document.write( "3x + 2y = 6 ------ eq (i)
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document.write( "2x + 5y = - 7 ---- eq (ii)
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document.write( "x - 3y = 13 ------ Subtracting eq (ii) from eq (i)
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document.write( "x = 13 + 3y ------ eq (iii)
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document.write( "3(13 + 3y) + 2y = 6 ------ Substituting 13 + 3y for x in eq (i)
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document.write( "39 + 9y + 2y = 6
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document.write( "11y = - 33
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document.write( "
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document.write( "Now, do you think you can find y? \n" );
document.write( "

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