document.write( "Question 1098994: Solve the following system of equations:
\n" ); document.write( "y = 3x + 15
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Algebra.Com's Answer #713411 by ikleyn(52790) $\"\"$ $\"About$

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document.write( "From the first equation, you just have an expression for y.\r\n" );
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document.write( "Substitute it into the second equation. You will get\r\n" );
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document.write( "2x - 3*(3x+15) = -17  ====>  2x - 9x - 45 = -17  ====>  -7x = -17 + 45  ====>  -7x = 28  ====>  x =  = -4.\r\n" );
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document.write( "Then from the first equation  y = 3*(-4) + 15 = -12 + 15 = 3.\r\n" );
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document.write( "Answer.  y-coordinate of the solution is y = 3.\r\n" );
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