Tutors Answer Your Questions about Linear-systems (FREE)
Question 428696: I know how to solve for X and Y in linear systems of equations using SUBSTITUTION. My teacher wants us to use ELIMINATION. The tool on this site asks me to check "Elimination or Substitution", but even when I ask it to use elimination--it solves my problem by substitution! I don't get the difference!! ex problem:
7x + 4y = 2
7x + 2y = 8
My answer is x=2 y=-3 Which I got by isolating 7x in each equation, then setting 2 equations equal to each other 2-4y = 8-2y
Click here to see answer by htmentor(1343)   |
Question 429179: . Solve the following system of equations.
3x + 4y = 4
2x + y = 6
2. Solve the following system of equations.
2x - 3y = 13
5x + 2y = 4
3. The Kraft Co. manufactures computer chips at a variable cost of $4 per chip and sells them for $10 each. If the fixed cost is $12,000 per month, what is the number of chips they would need to produce at the break-even point?
4. The Sunshine Bakery sells pies at a fixed price of p dollars per pie. The total number of pies demanded daily, D, is related to the price, p, in dollars by the equation:
D = -10p + 200
On the other hand, the daily supply of pies, S, is related to the price, p, per pie by the equation:
S = 15p - 50
Determine the equilibrium price of pies; that is, the price at which the supply, S, and demand, D, are equal.
Click here to see answer by ewatrrr(24785)  |
Question 429409: You invested money in two funds. Last year, the first fund paid a dividend of 8% and the second a dividend of 5%, and you received a total of $1330. This year, the first fund paid a 12% dividend and the second only 2% and you received a total of $1500. How much money did you invest in each fund?
Click here to see answer by mananth(16946)  |
Question 429501: A hotel has 200 rooms. Those with kitchen facilities rent for $100 per night and those without kitchen facilities rent for $80 per night. On a night when the hotel was completely occupied, revenues were $17,000. How many of each type of room does the hotel have?
Click here to see answer by mananth(16946) |
Question 429500: How many gallons of cream containing 25% butter fat and milk containing 3 1/2% butter fat must be mixed to obtain 50 gallons of cream containing 12 1/2% butter fat. And also how much cream and how much milk to the nearest hundredth of a gallon must b mixed together to obtain 50 gallons of cream that contains 12.5% butterfat?
Click here to see answer by mananth(16946) |
Question 429472: How many gallons of cream containing 25% butter fat and milk containing 3 1/2% butter fat must be mixed to obtain 50 gallons of cream containing 12 1/2% butter fat. And also how much cream and how much milk to the nearest hundredth of a gallon must b mixed together to obtain 50 gallons of cream that contains 12.5% butterfat?
Click here to see answer by mananth(16946) |
Question 429471: How many gallons of cream containing 25% butter fat and milk containing 3 1/2% butter fat must be mixed to obtain 50 gallons of cream containing 12 1/2% butter fat. And also how much cream and how much milk to the nearest hundredth of a gallon must b mixed together to obtain 50 gallons of cream that contains 12.5% butterfat?
Click here to see answer by mananth(16946) |
Question 429738: I'm working with a difference quotient problem. I haven't taken math for awhile and I'm having trouble with simplifying, though. Here's what I need to simplify:
-6x(x+h)^2+8(x+h)+5-(-6x^2+8x+5)
I understand that the next step includes a 12xh, and I have no clue where that's coming from. Thanks for your help!
Theresa
Click here to see answer by stanbon(75887) |
Question 429767: I need Help, can someone please explain to me what this question is asking and please give an example of the solution to it.
Describe the three possible relationships between two lines (i.e. system of equations) and what each indicates about the solution to the system.
Click here to see answer by richard1234(7193)  |
Question 430119: ok here is the question graph 4x-y=1 by finding ordered pairs to satisfy the equation
im studying the thea study guide i see this in the book and gives me values to replace x but i dont understand how you get the values. have not done this stuff in years please help, thanks
Click here to see answer by stanbon(75887) |
Question 430119: ok here is the question graph 4x-y=1 by finding ordered pairs to satisfy the equation
im studying the thea study guide i see this in the book and gives me values to replace x but i dont understand how you get the values. have not done this stuff in years please help, thanks
Click here to see answer by haileytucki(390)  |
Question 430714: If anyone could please help me to solve these four problems it would be awesome! I am extremely lost. Please help! Thanks!! They use the Substituion Method & Addition Method. I can't figure out the solution sets. Thank you!
#1 Substituion Method:
#2 Substituion Method:
#3 Addition Method:
#4 Addition Method:
Click here to see answer by Alan3354(69443)  |
Question 430710: If anyone could please help me to solve these four problems it would be awesome! I am extremely lost. Please help! Thanks!! They use the Substituion Method & Addition Method. I can't figure out the solution sets. Thank you!
#1 Substituion Method:
x+y=1
x^2+xy-y^2=-11
#2 Substituion Method:
x^2+y^2=180
x-y=-6
#3 Addition Method:
2x^2+3y^2-30=0
5x^2-7y^2-17=0
#4 Addition Method:
x^2+y^2=16
y^2-3x=16
Click here to see answer by stanbon(75887) |
Question 430577: Hello,
I have 4 differnt problems that deal with Substitution Method & Addition Method in which I am hoping you will be able to help me understand how to solve them.
The first one is with Substituion Method I can't figure out the solution sets.
The second one is with Substituion Method as well
I cant figure out the solution sets.
The third problem is with Addition Method i am not sure of the solution sets on this one.
The final problem is with addition method as well I dont know the solution sets.
If you could please help me with these problems i would REALLYYY appriciate it! I am soooo lost. THANK YOUU!!
Click here to see answer by ankor@dixie-net.com(22740)  |
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Older solutions: 1..45, 46..90, 91..135, 136..180, 181..225, 226..270, 271..315, 316..360, 361..405, 406..450, 451..495, 496..540, 541..585, 586..630, 631..675, 676..720, 721..765, 766..810, 811..855, 856..900, 901..945, 946..990, 991..1035, 1036..1080, 1081..1125, 1126..1170, 1171..1215, 1216..1260, 1261..1305, 1306..1350, 1351..1395, 1396..1440, 1441..1485, 1486..1530, 1531..1575, 1576..1620, 1621..1665, 1666..1710, 1711..1755, 1756..1800, 1801..1845, 1846..1890, 1891..1935, 1936..1980, 1981..2025, 2026..2070, 2071..2115, 2116..2160, 2161..2205, 2206..2250, 2251..2295, 2296..2340, 2341..2385, 2386..2430, 2431..2475, 2476..2520, 2521..2565, 2566..2610, 2611..2655, 2656..2700, 2701..2745, 2746..2790, 2791..2835, 2836..2880, 2881..2925, 2926..2970, 2971..3015, 3016..3060, 3061..3105, 3106..3150, 3151..3195, 3196..3240, 3241..3285, 3286..3330, 3331..3375, 3376..3420, 3421..3465, 3466..3510, 3511..3555, 3556..3600, 3601..3645, 3646..3690, 3691..3735, 3736..3780, 3781..3825, 3826..3870, 3871..3915, 3916..3960, 3961..4005, 4006..4050, 4051..4095, 4096..4140, 4141..4185, 4186..4230, 4231..4275, 4276..4320, 4321..4365, 4366..4410, 4411..4455, 4456..4500, 4501..4545, 4546..4590, 4591..4635, 4636..4680, 4681..4725, 4726..4770, 4771..4815, 4816..4860, 4861..4905, 4906..4950, 4951..4995, 4996..5040, 5041..5085, 5086..5130, 5131..5175, 5176..5220, 5221..5265, 5266..5310, 5311..5355, 5356..5400, 5401..5445, 5446..5490, 5491..5535, 5536..5580, 5581..5625, 5626..5670, 5671..5715, 5716..5760, 5761..5805, 5806..5850, 5851..5895, 5896..5940, 5941..5985, 5986..6030, 6031..6075, 6076..6120, 6121..6165, 6166..6210, 6211..6255, 6256..6300, 6301..6345, 6346..6390, 6391..6435, 6436..6480, 6481..6525, 6526..6570, 6571..6615, 6616..6660, 6661..6705, 6706..6750, 6751..6795, 6796..6840, 6841..6885, 6886..6930, 6931..6975, 6976..7020, 7021..7065, 7066..7110, 7111..7155, 7156..7200, 7201..7245, 7246..7290, 7291..7335, 7336..7380, 7381..7425, 7426..7470, 7471..7515, 7516..7560, 7561..7605, 7606..7650, 7651..7695, 7696..7740, 7741..7785, 7786..7830, 7831..7875, 7876..7920, 7921..7965, 7966..8010, 8011..8055, 8056..8100, 8101..8145, 8146..8190, 8191..8235, 8236..8280, 8281..8325, 8326..8370, 8371..8415, 8416..8460, 8461..8505, 8506..8550, 8551..8595, 8596..8640, 8641..8685, 8686..8730, 8731..8775, 8776..8820, 8821..8865, 8866..8910, 8911..8955, 8956..9000, 9001..9045, 9046..9090, 9091..9135, 9136..9180, 9181..9225, 9226..9270, 9271..9315, 9316..9360, 9361..9405, 9406..9450, 9451..9495, 9496..9540, 9541..9585, 9586..9630, 9631..9675, 9676..9720, 9721..9765, 9766..9810, 9811..9855, 9856..9900, 9901..9945, 9946..9990, 9991..10035, 10036..10080, 10081..10125, 10126..10170, 10171..10215, 10216..10260, 10261..10305, 10306..10350, 10351..10395, 10396..10440, 10441..10485, 10486..10530, 10531..10575, 10576..10620, 10621..10665, 10666..10710, 10711..10755, 10756..10800, 10801..10845, 10846..10890, 10891..10935, 10936..10980, 10981..11025, 11026..11070, 11071..11115, 11116..11160, 11161..11205, 11206..11250, 11251..11295, 11296..11340, 11341..11385, 11386..11430, 11431..11475, 11476..11520, 11521..11565, 11566..11610, 11611..11655, 11656..11700, 11701..11745, 11746..11790, 11791..11835, 11836..11880, 11881..11925, 11926..11970, 11971..12015, 12016..12060, 12061..12105, 12106..12150, 12151..12195, 12196..12240, 12241..12285, 12286..12330, 12331..12375, 12376..12420, 12421..12465, 12466..12510, 12511..12555, 12556..12600, 12601..12645, 12646..12690, 12691..12735, 12736..12780, 12781..12825, 12826..12870, 12871..12915, 12916..12960, 12961..13005, 13006..13050, 13051..13095, 13096..13140, 13141..13185, 13186..13230, 13231..13275, 13276..13320, 13321..13365, 13366..13410, 13411..13455, 13456..13500, 13501..13545, 13546..13590, 13591..13635, 13636..13680, 13681..13725, 13726..13770, 13771..13815, 13816..13860, 13861..13905, 13906..13950, 13951..13995, 13996..14040, 14041..14085, 14086..14130, 14131..14175, 14176..14220, 14221..14265, 14266..14310, 14311..14355, 14356..14400, 14401..14445, 14446..14490, 14491..14535, 14536..14580, 14581..14625, 14626..14670, 14671..14715, 14716..14760, 14761..14805, 14806..14850, 14851..14895, 14896..14940, 14941..14985, 14986..15030, 15031..15075, 15076..15120, 15121..15165, 15166..15210, 15211..15255, 15256..15300, 15301..15345, 15346..15390, 15391..15435, 15436..15480, 15481..15525, 15526..15570, 15571..15615, 15616..15660, 15661..15705, 15706..15750, 15751..15795, 15796..15840, 15841..15885, 15886..15930, 15931..15975, 15976..16020, 16021..16065, 16066..16110, 16111..16155, 16156..16200, 16201..16245, 16246..16290, 16291..16335, 16336..16380, 16381..16425, 16426..16470, 16471..16515
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