document.write( "Question 175203: Can you please help me by WALKING me through how we determine that the intesect points for these two equations is (3,-1): (x - y = 4) & (x + y = 2). I need to see each step in the process of coming up with (3, -1). I know that these two points solves both equations. Thanks, Charlie \n" ); document.write( "
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Can you please help me by WALKING me through how we determine that the intesect points for these two equations is (3,-1): (x - y = 4) & (x + y = 2). I need to see each step in the process of coming up with (3, -1). I know that these two points solves both equations. Thanks, Charlie
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\n" ); document.write( "You determine the \"solution\" for the system of the 2 eqns. The solution is the point, or the values that satisfy both eqns. In graphical terms, it's where the 2 lines cross (these are linear, so they're straight lines).
\n" ); document.write( "x - y = 4
\n" ); document.write( "x + y = 2
\n" ); document.write( "Solve by elimination and substitution, since the coeffs are all 1's.
\n" ); document.write( "Add the 2 eqns
\n" ); document.write( "2x + 0y = 6
\n" ); document.write( "x = 3
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\n" ); document.write( "Sub x into either eqn to find y, I'll use eqn 1.
\n" ); document.write( "3 - y = 4
\n" ); document.write( "y = -1
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\n" ); document.write( "Those 2 values are the point (3,-1)\r
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