document.write( "Question 181985: I am trying to help my duahgter with her pre-algebra. Her paper only states the following: y = 2x-5 x-y = 2
\n" ); document.write( "She does not know the formula to figure this out. I have forgotten...can you please help us? \n" ); document.write( "
Algebra.Com's Answer #136600 by nerdybill(7384)\"\" \"About 
You can put this solution on YOUR website!
You can apply the \"substitution method\".
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\n" ); document.write( "y = 2x-5 (equation 1)
\n" ); document.write( "x-y = 2 (equation 2)
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\n" ); document.write( "Use the definition of 'y' from equation 1 and substitute it into equation 2 -- then solve for x:
\n" ); document.write( "x-y = 2
\n" ); document.write( "Substitute our definition of y:
\n" ); document.write( "x-(2x-5) = 2
\n" ); document.write( "x-2x+5 = 2
\n" ); document.write( "-x + 5 = 2
\n" ); document.write( "5 = x + 2
\n" ); document.write( "3 = x (solution for x)
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\n" ); document.write( "Substitute the above into equation 2 and solve for y:
\n" ); document.write( "x-y = 2
\n" ); document.write( "3-y = 2
\n" ); document.write( "3 = y+2
\n" ); document.write( "1 = y (solution of y)
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\n" ); document.write( "Final answer:
\n" ); document.write( "(x,y) = (3,1)\r
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