document.write( "Question 1116288: how do I solve -x-5y+z=17
\n" ); document.write( " -x-y+z=1
\n" ); document.write( " 2x+5y-3z=-10 \n" ); document.write( "
Algebra.Com's Answer #731181 by MathTherapy(10552)\"\" \"About 
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how do I solve -x-5y+z=17
\n" ); document.write( " -x-y+z=1
\n" ); document.write( " 2x+5y-3z=-10
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- x - 5y + z = 17 ------- eq (i)
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document.write( "- x - y + z = 1 --------- eq (ii)
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document.write( "2x + 5y - 3z = - 10 ----- eq (iii)
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document.write( "4y = - 16  -------- Subtracting eq (i) from eq (ii)
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document.write( "Right away you can see that \"highlight_green%28matrix%281%2C5%2C+y%2C+%22=%22%2C+%28-+16%29%2F4%2C+%22=%22%2C+-+4%29%29\"
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document.write( "- x - 5(- 4) + z = 17 ------- Substituting - 4 for y in eq (i)
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document.write( "- x + 20 + z = 17
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document.write( "- x + z = - 3 ------- eq (iv)\r
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document.write( "2x + 5(- 4) - 3z = - 10 ------- Substituting - 4 for y in eq (iii)
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document.write( "2x - 20 - 3z = - 10
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document.write( "2x - 3z = 10 ------- eq (v)
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document.write( "- 3x + 3z = - 9 ------- Multiplying eq (iv) by 3 ------ eq (vi)
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document.write( "- x = 1 ------- Adding eqs (v) & (vi)
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document.write( "\"highlight_green%28matrix%281%2C5%2C+x%2C+%22=%22%2C+1%2F%28-+1%29%2C+%22=%22%2C+-+1%29%29\"
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document.write( "I leave it to you to find z
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document.write( "By the way. z CAN NEVER = 28, as YOU-KNOW-WHO will have you believe! \n" );
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