document.write( "Question 1113803: Can this system by solved by substitution?
\n" ); document.write( "6x + 7y = -9
\n" ); document.write( "-4x - 5y = 5 \n" ); document.write( "

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\n" ); document.write( " Solve the first eq for x: x = (-9 - 7y) / 6
\n" ); document.write( " Substitute the RHS of this for 'x' in the 2nd eq:
\n" ); document.write( " $\"+-4++%28green%28%28-9-7y%29%2F6%29%29+-+5y++=+5+\"$
\n" ); document.write( " 36 + 28y - 30y = 30
\n" ); document.write( " -2y = -6
\n" ); document.write( " y = 3 Ч> x = (-9 - 21)/6 = -5\r
\n" ); document.write( "\n" ); document.write( "ЧЧЧЧ
\n" ); document.write( " Ans: $\"+highlight%28+x+=+-5+%29+\"$ , $\"+highlight%28+y+=+3+%29\"$
\n" ); document.write( "ЧЧЧЧ
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\n" ); document.write( "Check:
\n" ); document.write( "(1) 6x + 7y = 6(-5) + 7(3) = -30 + 21 = -9 (ok)
\n" ); document.write( " (2) -4x - 5y = -4(-5) - 5(3) = 20 - 15 = 5 (ok)\r
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