document.write( "Question 1106880: how do i solve this by substitution: 5x+2y=9
\n" ); document.write( " y=-x-3 and how do i solve it bye graphing \n" ); document.write( "

Algebra.Com's Answer #721878 by stanbon(75887) $\"\"$ $\"About$

You can put this solution on YOUR website!
solve this by substitution: 5x+2y=9 ; y=-x-3
\n" ); document.write( "5x+2(-x-3) = 9
\n" ); document.write( "5x-2x-6 = 9
\n" ); document.write( "3x = 15
\n" ); document.write( "x = 5
\n" ); document.write( "----
\n" ); document.write( "y = -x-3 = -5-3 = -8
\n" ); document.write( "Ans:: (5,-8)
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\n" ); document.write( "and how do i solve it by graphing
\n" ); document.write( "graph y = -x-3
\n" ); document.write( "If x = 0, y = -3
\n" ); document.write( "If x = -3, y = 0
\n" ); document.write( "Plot (0,-3) and (-3,0) and draw a line thru them.
\n" ); document.write( "---
\n" ); document.write( "graph 5x+2y = 9
\n" ); document.write( "y = (-5x+9)/2
\n" ); document.write( "If x = 0, y = 9/2
\n" ); document.write( "If x = 1/5, y = 4
\n" ); document.write( "Plot (0,4.5) and (1/5,4) and draw a line thru them.
\n" ); document.write( " $\"graph+%28400%2C400%2C-10%2C10%2C-10%2C10%2C-x-3%2C%28-5x%2B9%29%2F2%29\"$
\n" ); document.write( "The lines intersect at (5,-8)
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.
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