document.write( "Question 363830: I need help in solving the system of equations by elimination.
\n" ); document.write( "1. 2x-y=3; x+2y=-1
\n" ); document.write( "2. x+2y=-4; 2x-3y=1
\n" ); document.write( "3. Solve the system of equations by substitution. 3x+y=3; y=-x-3\r
\n" ); document.write( "\n" ); document.write( "How do you solve the system of equations by graphing?
\n" ); document.write( "4. x+2y=-1; 2x+2y=-4
\n" ); document.write( "5. y=2x; y=x+2\r
\n" ); document.write( "\n" ); document.write( "Thank you for help.
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Algebra.Com's Answer #259490 by ewatrrr(24785) $\"\"$ $\"About$

You can put this solution on YOUR website!


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document.write( "Hi, 
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document.write( "solving a system of equations by elimination
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document.write( "Example: Note: the process is to eliminate one of the variables
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document.write( " 2x- y = 3  
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document.write( "  x+2y = -1
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document.write( "Multiply both sides of the equation by 2 to eliminate the y varaible
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document.write( " 4x- 2y = 6 
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document.write( "  x+ 2y = -1
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document.write( "Add:
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document.write( "5x = 5  Solve for x and substitute into one of the original equations to find y
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document.write( "x = 1  (2-y = 3)  y = -1  check your answers using one of the equations\r
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document.write( "Solve a system of equations by substitution
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document.write( "Ex: 3x+y=3; y=-x-3
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document.write( "substituting y=-x-3 for y
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document.write( "3x + (-x-3)=3    
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document.write( "2x = 6  
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document.write( "x = 3  substitute value for x into y = -x -3,  y = -6
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document.write( "check your answers using one of the equations\r
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document.write( "solve  system of equations by graphing
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document.write( "read from graph where the two lines intersect:  Pt(2,4)
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document.write( "check your answer by substituting the ordered pair into one of the equations
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document.write( "ex: y=2x; y=x+2 
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