document.write( "Question 235182: How do you find the point of intersection between y=-1/2x+4 and y=2x+8 \n" ); document.write( "
Algebra.Com's Answer #173317 by stanbon(75887)\"\" \"About 
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How do you find the point of intersection between
\n" ); document.write( "y=-1/2x+4 and y=2x+8
\n" ); document.write( "--------------------------
\n" ); document.write( "Substitute for y and solve for \"x\":
\n" ); document.write( "1/2x+4 = 2x+8
\n" ); document.write( "---
\n" ); document.write( "(2x+4)(2x+8) = 1
\n" ); document.write( "4(x+2)(x+4) = 1
\n" ); document.write( "4(x^2+6x+8) = 1
\n" ); document.write( "x^2+6x+8-1/4
\n" ); document.write( "x^2+6x+7.75 = 0
\n" ); document.write( "---
\n" ); document.write( "x = [-6 +- sqrt(36 -4*7.75)]/2
\n" ); document.write( "---
\n" ); document.write( "x = [-6 +- sqrt(5))/2
\n" ); document.write( "---
\n" ); document.write( "x = -3 +- 1.118
\n" ); document.write( "---
\n" ); document.write( "x = -4.118 or x = -1.882
\n" ); document.write( "===========================
\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H. \n" ); document.write( "
\n" );