document.write( "Question 805693: The question for solving systems using substitution is: 6x-4y=54 and -9x+2y=-69
\n" ); document.write( "I tried to solve it by getting x variable alone in 6x-4y=54 and rewrote it into 6x=-4y+54/6
\n" ); document.write( " I don't know if I am doing it right,thanks.
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Algebra.Com's Answer #485405 by Alan3354(69443)\"\" \"About 
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The question for solving systems using substitution is: 6x-4y=54 and -9x+2y=-69
\n" ); document.write( "I tried to solve it by getting x variable alone in 6x-4y=54 and rewrote it into
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\n" ); document.write( "6x=-4y+54/6 **** You divided 54 by 6, but not the other terms.
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\n" ); document.write( "6x-4y=54
\n" ); document.write( "-9x+2y=-69
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\n" ); document.write( "Usually, you solve one eqn for x or y, then sub into the other one. For this one, that would cause fractions, so I'll solve for 2y and sub for that.
\n" ); document.write( "3x-2y = 27 --> 2y = 3x - 27
\n" ); document.write( "-9x+2y=-69
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\n" ); document.write( "Sub for 2y in the 2nd eqn
\n" ); document.write( "-9x+2y=-69
\n" ); document.write( "-9x+ (3x-27) = -69
\n" ); document.write( "-6x = -42
\n" ); document.write( "x = 7
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\n" ); document.write( "Sub for x in any eqn and find y \n" ); document.write( "
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