document.write( "Question 59409: What are some easy steps in solving 2 equations with 2 variables by canceling out one variable while adding both equations together? Apparently when you get your answer, it is suppose to be (x,y) form and nothing else. I am just so confused because the curriculum I have for homeschooling doesn't explain it very well. So, I am in need of some assistance if you can help! I hope I explained my delemma to where you understand it. Thank you...I hope I hear from you soon!\r
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document.write( " Thanks a bunch!
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document.write( " Stephanie \n" );
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Algebra.Com's Answer #40708 by funmath(2933)![]() ![]() ![]() You can put this solution on YOUR website! Here's an example of a problem that I solved for another student, I explained the steps. I hope that makes things clearer. \n" ); document.write( ": \n" ); document.write( "Solve the following systems by addition. If a unique solution does not exist, I need to state whether the system is inconsistent or dependent. \n" ); document.write( ": \n" ); document.write( "L1) 2x + 3y = 1 \n" ); document.write( "L2) 5x + 3y = 16 \n" ); document.write( ": \n" ); document.write( "Multiply L2 by -1 and add it to L2 and the y's will be eliminated. \n" ); document.write( "-1(5x+3y)=-1(16) --->> -5x-3y=-16 \n" ); document.write( ": \n" ); document.write( "2x +3y=1 \n" ); document.write( "-5x-3y=-16 \n" ); document.write( "____________ \n" ); document.write( "-3x+0y=-15 \n" ); document.write( "-3x=-15 \n" ); document.write( "-3x/-3=-15/-3 \n" ); document.write( "x=5 \n" ); document.write( "Substitute x=5 into L1 and solve for y: \n" ); document.write( "2(5)+3y=1 \n" ); document.write( "10+3y=1 \n" ); document.write( "-10+10+3y=1-10 \n" ); document.write( "3y=-9 \n" ); document.write( "3y/3=-9/3 \n" ); document.write( "y=-3 \n" ); document.write( ": \n" ); document.write( "The solution is (x,y)=(5,-3) \n" ); document.write( ": \n" ); document.write( "FYI, if you go to eliminate one variable and both variables get eliminated and you get two numbers that aren't equal like 4=5, then the system has no solution and is inconsistent. If the same thing happens, but the numbers left do equal each other like 4=4, then the system has an infinite number of solutions and the system is dependent. \n" ); document.write( ": \n" ); document.write( "Happy Calculating!!! \n" ); document.write( " |