document.write( "Question 152808: solve the system:\r
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document.write( "x+3y+5z=20
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document.write( "y-4z=-16
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document.write( "3x-2y+9z=36 \n" );
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Algebra.Com's Answer #112899 by Electrified_Levi(103)![]() ![]() ![]() You can put this solution on YOUR website! Hi, Hope I can help, \n" ); document.write( ". \n" ); document.write( "solve the system: \n" ); document.write( ". \n" ); document.write( "x+3y+5z=20 \n" ); document.write( "y-4z=(-16) \n" ); document.write( "3x-2y+9z=36 \n" ); document.write( ". \n" ); document.write( "This is the way I usually solve these problems(pretty easy once you know how to do it) ( There is no fast way to solve these problems) \n" ); document.write( ". \n" ); document.write( "First, solve for a letter in all the equations( since we already have a 2 system/variable equation for equation 2, we don't have to solve for any letter in equation 2)( Since \n" ); document.write( ". \n" ); document.write( "We will rewrite the 3 equations so it makes more sense( the second equation has no \"x's\" in the equation so it has \"0x\") \n" ); document.write( ". \n" ); document.write( " \n" ); document.write( "x+3y+5z=20 \n" ); document.write( "0x + y - 4z =( -16) \n" ); document.write( "3x-2y+9z=36 \n" ); document.write( ". \n" ); document.write( "We will switch the equations around \n" ); document.write( ". \n" ); document.write( "x+3y+5z=20 \n" ); document.write( "3x-2y+9z=36 \n" ); document.write( "0x + y - 4z = (-16) \n" ); document.write( ". \n" ); document.write( "We will solve \"x\" in our first two equations(can't solve \"x\" in our third equation, since it is 0x) \n" ); document.write( ". \n" ); document.write( "First equation \n" ); document.write( ". \n" ); document.write( " \n" ); document.write( ". \n" ); document.write( "We will move \"3y\" over to the right side \n" ); document.write( ". \n" ); document.write( " \n" ); document.write( ". \n" ); document.write( " \n" ); document.write( ". \n" ); document.write( "We will move \"5z\" to the right side \n" ); document.write( ". \n" ); document.write( " \n" ); document.write( ". \n" ); document.write( " \n" ); document.write( ". \n" ); document.write( "We will switch the letters around \n" ); document.write( ". \n" ); document.write( " \n" ); document.write( ". \n" ); document.write( "This is our First Answer \n" ); document.write( ". \n" ); document.write( "We will now solve \"x\" in our second equation \n" ); document.write( ". \n" ); document.write( " \n" ); document.write( ". \n" ); document.write( "We will move (-2y) to the right side \n" ); document.write( ". \n" ); document.write( " \n" ); document.write( ". \n" ); document.write( " \n" ); document.write( ". \n" ); document.write( "We will move \"9z\" to the right side \n" ); document.write( ". \n" ); document.write( " \n" ); document.write( ". \n" ); document.write( " \n" ); document.write( ". \n" ); document.write( "We will switch the letters around \n" ); document.write( ". \n" ); document.write( " \n" ); document.write( ". \n" ); document.write( "We will now divide each side by \"3\" \n" ); document.write( ". \n" ); document.write( " \n" ); document.write( ". \n" ); document.write( " \n" ); document.write( ". \n" ); document.write( " \n" ); document.write( ". \n" ); document.write( "Our second answer = \n" ); document.write( ". \n" ); document.write( "We can now solve to get a 2 system(variable) equation \n" ); document.write( ". \n" ); document.write( "We will put our two answers together in an equation, since \"x\" = both of the answers, our answers equal each other \n" ); document.write( ". \n" ); document.write( "First answer = \n" ); document.write( ". \n" ); document.write( "Second answer = \n" ); document.write( ". \n" ); document.write( "Our equation will equal \n" ); document.write( ". \n" ); document.write( " \n" ); document.write( ". \n" ); document.write( "We will use cross multiplication to get rid of the fractions \n" ); document.write( ". \n" ); document.write( " \n" ); document.write( ". \n" ); document.write( " \n" ); document.write( ". \n" ); document.write( "We will move (-9y) to the right side \n" ); document.write( ". \n" ); document.write( " \n" ); document.write( ". \n" ); document.write( " \n" ); document.write( ". \n" ); document.write( "We will move the (-15z) to the right side \n" ); document.write( ". \n" ); document.write( " \n" ); document.write( ". \n" ); document.write( " \n" ); document.write( ". \n" ); document.write( "We will move the \"36\" to the left side \n" ); document.write( ". \n" ); document.write( " \n" ); document.write( ". \n" ); document.write( " \n" ); document.write( ". \n" ); document.write( "We will rearrange, \n" ); document.write( ". \n" ); document.write( "Our second 2 system/variable equation = \n" ); document.write( ". \n" ); document.write( "We will put our two 2 system/variable equations side by side \n" ); document.write( ". \n" ); document.write( "First equation = \n" ); document.write( ". \n" ); document.write( "Second equation = \n" ); document.write( ". \n" ); document.write( " \n" ); document.write( ". \n" ); document.write( " \n" ); document.write( ". \n" ); document.write( "We will now need to solve for a letter again( we will solve \"y\" since it is the easiest to solve) \n" ); document.write( ". \n" ); document.write( "First equation \n" ); document.write( ". \n" ); document.write( "We will move (-4z) to the right side \n" ); document.write( ". \n" ); document.write( " \n" ); document.write( ". \n" ); document.write( " \n" ); document.write( ". \n" ); document.write( " \n" ); document.write( ". \n" ); document.write( "Our first answer = \n" ); document.write( ". \n" ); document.write( "Our second equation \n" ); document.write( ". \n" ); document.write( "We will move \"6z\" to the right side \n" ); document.write( ". \n" ); document.write( " \n" ); document.write( ". \n" ); document.write( " \n" ); document.write( ". \n" ); document.write( "Rearranging \n" ); document.write( ". \n" ); document.write( "We will divide each side by \"11\" \n" ); document.write( ". \n" ); document.write( " \n" ); document.write( ". \n" ); document.write( " \n" ); document.write( ". \n" ); document.write( " \n" ); document.write( ". \n" ); document.write( "Our second answer is \n" ); document.write( ". \n" ); document.write( "We can now put both of our answers into an equation( since \"y\" equals both of our answers) \n" ); document.write( ". \n" ); document.write( "Answer 1 = \n" ); document.write( ". \n" ); document.write( "Answer 2 = \n" ); document.write( ". \n" ); document.write( "We can make our equation, it equals \n" ); document.write( ". \n" ); document.write( " \n" ); document.write( ". \n" ); document.write( "We will cross multiply to get rid of the fractions \n" ); document.write( ". \n" ); document.write( " \n" ); document.write( ". \n" ); document.write( "It becomes, \n" ); document.write( ". \n" ); document.write( "We will move (-6z) to the left side \n" ); document.write( ". \n" ); document.write( " \n" ); document.write( ". \n" ); document.write( " \n" ); document.write( ". \n" ); document.write( "We will move (-176) to the right side \n" ); document.write( ". \n" ); document.write( " \n" ); document.write( ". \n" ); document.write( " \n" ); document.write( ". \n" ); document.write( "We will divide each side by \"50\" \n" ); document.write( ". \n" ); document.write( " \n" ); document.write( ". \n" ); document.write( " \n" ); document.write( ". \n" ); document.write( " \n" ); document.write( ". \n" ); document.write( "We found that \"z\" = 4, we can replace \"z\" with \"4\" in one of our 2 system/variable equations \n" ); document.write( ". \n" ); document.write( " \n" ); document.write( ". \n" ); document.write( " \n" ); document.write( ". \n" ); document.write( "We will use the first equation \n" ); document.write( ". \n" ); document.write( " \n" ); document.write( ". \n" ); document.write( " \n" ); document.write( ". \n" ); document.write( "We will move (-16) to the right \n" ); document.write( ". \n" ); document.write( " \n" ); document.write( ". \n" ); document.write( " \n" ); document.write( ". \n" ); document.write( "We found that \"y\" = \"0\" \n" ); document.write( ". \n" ); document.write( "We can now find \"x\", we need to replace \"y\" and \"z\" in one of the three original equations \n" ); document.write( ". \n" ); document.write( "y = 0 \n" ); document.write( "z = 4 \n" ); document.write( ". \n" ); document.write( "x+3y+5z=20 \n" ); document.write( "y-4z=(-16) \n" ); document.write( "3x-2y+9z=36 \n" ); document.write( ". \n" ); document.write( "We will use the first equation, since it will be the easiest( we can't use the second equation) \n" ); document.write( ". \n" ); document.write( " \n" ); document.write( ". \n" ); document.write( " \n" ); document.write( ". \n" ); document.write( " \n" ); document.write( ". \n" ); document.write( "We will move the \"20\" over to the right side \n" ); document.write( ". \n" ); document.write( " \n" ); document.write( ". \n" ); document.write( " \n" ); document.write( ". \n" ); document.write( "We found that \"x\" = \"0\", we now have all 3 variables, \"x\",\"y\", and \"z\" \n" ); document.write( ". \n" ); document.write( "x = 0 \n" ); document.write( "y = 0 \n" ); document.write( "z = 4 \n" ); document.write( ". \n" ); document.write( "We can check by replacing the letters with numbers in our third equation \n" ); document.write( ". \n" ); document.write( " \n" ); document.write( ". \n" ); document.write( " \n" ); document.write( ". \n" ); document.write( " \n" ); document.write( ". \n" ); document.write( "x = 0 \n" ); document.write( "y = 0 \n" ); document.write( "z = 4 \n" ); document.write( ". \n" ); document.write( "The solution set = (x,y,z), our solution set = (0,0,4) \n" ); document.write( ". \n" ); document.write( "Hope I helped, Levi \n" ); document.write( " |