document.write( "Question 173846: Can you help me find a solution? I used a substitution method by it seem it does not work.
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document.write( "1.The Everton college store paid $1660 for an order of 44 calculators. The store paid $11 for each scientific calculator. The others, all graph calculators, cost the store $53 each. How many of each type of calculator was order?\r
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document.write( "The store ordered__scientific calculators and __graphing calculators.\r
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document.write( "2. Elimination method
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document.write( " 0.3x-0.2y=4
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document.write( " 0.2x+0.3y=-23/19\r
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document.write( "3. Substitution method\r
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document.write( " 6x+7y=-22
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document.write( " -3x+y=20
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Algebra.Com's Answer #128723 by stanbon(75887)![]() ![]() ![]() You can put this solution on YOUR website! 1.The Everton college store paid $1660 for an order of 44 calculators. The store paid $11 for each scientific calculator. The others, all graph calculators, cost the store $53 each. How many of each type of calculator was order? \n" ); document.write( "--- \n" ); document.write( "Value equation: 11s + 53g = 1660 \n" ); document.write( "Quantity equation: s + g = 44 \n" ); document.write( "-------- \n" ); document.write( "Substitution Method: \n" ); document.write( "s = 44-g \n" ); document.write( "Substitute into the 1st equation: \n" ); document.write( "11(44-g) + 53g = 1660 \n" ); document.write( "484 - 11g + 53g = 1660 \n" ); document.write( "42g = 1176 \n" ); document.write( "g = 28 (# of graphing calculators purchased) \n" ); document.write( "--------- \n" ); document.write( "Substitute into s = 44-g to get: \n" ); document.write( "s = 44-28 = 16 (# of scientific calculators purchased) \n" ); document.write( "--------------------------------------------------------------\r \n" ); document.write( "\n" ); document.write( "2. Elimination method \n" ); document.write( "0.3x-0.2y=4 \n" ); document.write( "0.2x+0.3y=-23/19 \n" ); document.write( "------- \n" ); document.write( "Modify the equations: \n" ); document.write( "3x - 2y = 40 \n" ); document.write( "2x + 3y = -230/19 \n" ); document.write( "--------------------- \n" ); document.write( "Modify for elimination: \n" ); document.write( "6x - 4y = 80 \n" ); document.write( "6x + 9y = -690/19 \n" ); document.write( "------------------- \n" ); document.write( "Substract 1st from 2nd to get: \n" ); document.write( "13y =(-690/19) - 80 = -116.3158 \n" ); document.write( "y = -8.9474 \n" ); document.write( "------------ \n" ); document.write( "Substitute into 3x-2y=40 to solve for x: \n" ); document.write( "3x - 2(-8.9474) = 40 \n" ); document.write( "3x = 22.1053 \n" ); document.write( "x = 7.3684333... \n" ); document.write( "--------------------- \n" ); document.write( "Cheers, \n" ); document.write( "Stan H. \r \n" ); document.write( "\n" ); document.write( "3. Substitution method \n" ); document.write( "6x+7y=-22 \n" ); document.write( "-3x+y=20 \n" ); document.write( " \n" ); document.write( " |