document.write( "Question 192761This question is from textbook
\n" ); document.write( ": 1.Solve by substitution or elimination method: I just need to know the steps involved to solve the problem, please show work, I don't need the graphs. Thanks!\r
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\n" ); document.write( " -12x + 15y = -42 \n" ); document.write( "

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document.write( "4x – 5y = 14 .............eq 1   ---->-5y=-4x+14--->y=(4/5)x-14/5
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document.write( "-12x + 15y = -42..........eq 2   ---->15y=12x-42--->y=(4/5)x-14/5
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document.write( "using elimination: multiply eq 1 by 3 and add the two equations together
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document.write( " 12x-15y=42.......eq 1 revised
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document.write( "-12x+15y=-42.....eq 2
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document.write( "All terms will be eliminated in this system.  In this case one can see that eq 2 is just eq 1 multiplied by -1......therefore these are the same exact lines
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document.write( "hence this system has infinite solutions
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