document.write( "Question 382249: PLEASE HELP. I wanted to put some effort but does not look right.
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document.write( "Solve the system of equations by graphing. Then classify the system. \r
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document.write( "4x-y =20
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document.write( "4x+5y = -28;\r
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document.write( "I substituted for x with 5 in the first equation: 4 (5)-y = 20-5; y = 15; (5,15)\r
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document.write( "I then substituted -9 for y in the same equation: 4x-(-9) = 20; 4x+9-9=20-9; x = 2.75; (2.75, -9).\r
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document.write( "Second equation
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document.write( "4x+5y = -28; I substituted 0 for x; 4(0)+5y = -28; y = -5.6. The first point is (0,-5.6).
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document.write( "I then substituted -9 for y in the same equation; 4x+5(-9) = -38; 4x+45-45 = -38-45; 4x=7; Divide by 4; x = 1.8; Second points (1.8, -9)
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document.write( "They are consistent because of one solution and are independent as well?? help. \n" );
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Algebra.Com's Answer #270967 by Alan3354(69443)![]() ![]() You can put this solution on YOUR website! Solve the system of equations by graphing. Then classify the system. \n" ); document.write( "4x-y =20 \n" ); document.write( "4x+5y = -28; \n" ); document.write( "I substituted for x with 5 in the first equation: 4 (5)-y = 20-5; y = 15; (5,15) \n" ); document.write( "--------------- \n" ); document.write( "4x-y = 20 \n" ); document.write( "4*5 - y = 20 \n" ); document.write( "y = 0 \n" ); document.write( "(5,0) is better. \n" ); document.write( "--------------------- \n" ); document.write( "I then substituted -9 for y in the same equation: 4x-(-9) = 20; 4x+9-9=20-9; x = 2.75; (2.75,-9) \n" ); document.write( "------------------- \n" ); document.write( "------------------- \n" ); document.write( "Second equation \n" ); document.write( "4x+5y = -28; I substituted 0 for x; 4(0)+5y = -28; y = -5.6. The first point is (0,-5.6) \n" ); document.write( "----------------- \n" ); document.write( "I then substituted -9 for y in the same equation; 4x+5(-9) = -38; 4x+45-45 = -38-45; 4x=7; Divide by 4; x = 1.8; Second points (1.8,-9) \n" ); document.write( "-------------- \n" ); document.write( "4x - 45 = -28 \n" ); document.write( "4x = 17 \n" ); document.write( "x = 4.25 \n" ); document.write( "(4.25,-9) not (1.8,-9) \n" ); document.write( "------------------------ \n" ); document.write( "They are consistent because of one solution and are independent as well?? help. \n" ); document.write( "------------- \n" ); document.write( "They're consistent and independent. \n" ); document.write( "If you plot the points and graph them, you'll see they intersect. \n" ); document.write( "------------- \n" ); document.write( "dl the FREE graph software at \n" ); document.write( "http://www.padowan.dk \n" ); document.write( " \n" ); document.write( " |