document.write( "Question 712540: Hi! would anyone know how to work problem -15x - 4y = -20 and 5x + 7y = 90 and show in detail about how you came up with a solution? \n" ); document.write( "
Algebra.Com's Answer #438021 by Alan3354(69443)\"\" \"About 
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-15x - 4y = -20
\n" ); document.write( "5x + 7y = 90
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\n" ); document.write( "Multiply the 2nd eqn by 3, then add them
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