Questions on Algebra: Systems of Linear Equations answered by real tutors!

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Question 1050019: can you please help with this systems of equations by graphing too
it's 4x-3y=-12, y=-2x+4
Click here to see answer by advanced_Learner(501)

Question 1050127: Another system of equations by graphing problem
it's x+2y=8 and 2x+4y=40 and I solved for y on the first one and I don't know what number to pick for x to make the first line.
Click here to see answer by josgarithmetic(39617)

Question 1050333: I need help with this system of equations the substitution method
Here's the problem: 2x+10y=4 and x=8-5y and I substituted the x=8-5y in for x and I got 2(8-5y)+10y=4 then I did the distributing and got 16-10y+10y=4 which I discovered was 0 after i combined them. And now I'm not sure where to go from here. So if you can please help me.
Click here to see answer by josgarithmetic(39617)

Question 1050346: How do I construct/make a system of three equations in three variables only given with the ordered triple (x, y, z)?
Click here to see answer by Fombitz(32388)

Question 1050421: A square has side length 4x-3n and an equilateral triangle has side length 5x-3. If the two figures have the same perimeters, what is the area of the square?
Click here to see answer by advanced_Learner(501)

Question 1050636: Graph the equation f(x) = [[3x]] + 3.

Click here to see answer by Fombitz(32388)

Question 1050698: Marie earned an extra $10,000 last year from a commission-based job. She invested part of the money at 10% and the rest at 8%. She made a total of $940. How much was invested at 8%? How much was invested at 10%?
Click here to see answer by ewatrrr(24785)

Question 1050447: A farmer uses a lever to move a large rock. The force required to move a rock varies inversely with the distance from the pivot point to the point of force is applied. A force of 50 pounds applied to the lever 36 inches from the pivot point of the lever will move the rock. Which function models the relationship between F, the amount of force applied to the lever, and d, the distance of the applied force from the pivot point?
Click here to see answer by josmiceli(19441)

Question 1051040: How do write a system of equations when the word problem says a product. Here is the word problem.
The difference of two numbers is 8; the product is 65. Find the two numbers.
Click here to see answer by jayreal(3)

Question 1050899: The sum of two numbers is 24. Seven times the smaller number is the same as 5 times the larger number. Find the smaller number.
Click here to see answer by Fombitz(32388)

Question 1051154: solve the following system of equation
2.4x-2.7y=9
-0.6x+2.8y=2
Click here to see answer by josgarithmetic(39617)

Question 1051154: solve the following system of equation
2.4x-2.7y=9
-0.6x+2.8y=2
Click here to see answer by MathTherapy(10552)

Question 1051161: 3x-6y=-6
Click here to see answer by josgarithmetic(39617)

Question 1051211: 4/5x + 1
Click here to see answer by ewatrrr(24785)

Question 1051232: Fred and Kate are brother and sister. Fred has three times as many sisters as brothers, and Kate has as many brothers as sisters. How many boys and girls are there in this family?
Click here to see answer by ankor@dixie-net.com(22740)

Question 1051349: In a three digit number, the hundreds digit is equal to the tens digit, and is two more than the ones digit. The number formed by reversing the digits is 19 times the sum of the digits. Find the original number. I need a very detailed explanation please!
Click here to see answer by josgarithmetic(39617)

Question 1051701: Systems of equations in three variables. Solve each system of equations.
2x-y+2z=15
-x+y+z=3
3x-y+2z=18
Click here to see answer by ikleyn(52782)

Question 1051746: Which system of equations cannot be
directly solved by applying the elimination
method?
A. 12𝑥 − 11𝑦 = −4
−6𝑥 − 11𝑦 = 7
B. 𝑥 − 11𝑦 = −6
𝑥 + 12𝑦 = −7
C. 7𝑥 + 11𝑦 = 12
−6𝑥 − 4𝑦 = −21
D. 𝑥 + 11𝑦 = 7
11𝑦 − 12𝑥 = 4

Click here to see answer by Fombitz(32388)

Question 1051757: Systems of Equations in three variables
x-4y+3z=-27
2x+2y-3z=22
4z-=-16
Click here to see answer by Fombitz(32388)

Question 1051755: L : y = 3x
M : 2x - 3y = -15
What is true about point (1,3) ?
A. it is on both lines
B. it is not on either line
C. it is on line l only
D. it is on line m only

Click here to see answer by Fombitz(32388)

Question 1051754: let A = (3,-2)
a. Line r is horizontal through A. Write an equation for r.
b. Line r is horizontal through A. Write an equation for s .
Click here to see answer by Fombitz(32388)

Question 1051789: john invested 50,000, part of it at 6% and the other part at 8%. The annual interest on the 6% investment was 480 more than that from the 8% investment. How much was invested at each rate?
Click here to see answer by Boreal(15235)

Question 1052045: determine is this is true or false and why
x-1 is a factor of x^80-1
X-1 is a factor of x^79-1
Click here to see answer by ikleyn(52782)

Question 1052047: find m such that x+2 is the factor of 3x^3+10x^2+mx+ 14
Click here to see answer by ikleyn(52782)

Question 1052049: let f(x) = 4x^3+21x^2-x-84
a. factor f(x) given that 3 is a zero of f(x)
b. find the solution set for f(x)=0
Click here to see answer by josgarithmetic(39617)

Question 1052089: Systems of equations in three variables HELP!!
a+b=3
-b+c=3
a+2c=10
Click here to see answer by josgarithmetic(39617)

Question 1052089: Systems of equations in three variables HELP!!
a+b=3
-b+c=3
a+2c=10
Click here to see answer by ikleyn(52782)

Question 1052089: Systems of equations in three variables HELP!!
a+b=3
-b+c=3
a+2c=10
Click here to see answer by MathTherapy(10552)

Question 1052139: x=�y+9 como grafico y determino la pendiente y ordenada al origen...intersecci�n con el eje x.y si es creciente o decreciente
Click here to see answer by Edwin McCravy(20055)

Question 1052130: Z=Ma=ba, solve for a
Click here to see answer by Edwin McCravy(20055)

Question 1052137: 3x-2y+5=3 dada esta f�rmula de funcion lineal como determino la pendiente y la ordenada al origen.intersecci�n con el eje x.graficada si es creciente o decreciente
Click here to see answer by stanbon(75887)

Question 1052175: x=1/2y+9....como grafico y determino la pendiente y la ordenada ,la intersecci�n con el eje x..creciente o decreciente
Click here to see answer by stanbon(75887)

Question 1052412: 1/3x+3/4y=2
4/9x-1/4y=4
Click here to see answer by Fombitz(32388)

Question 1052737: StartFraction 33 y minus 3 y squared plus 6 y cubed plus 18 Over 6 y plus 3 EndFraction
33y−3y2+6y3+18
6y+3

Click here to see answer by KMST(5328)

Question 1052825: 8.2 X 10^4 (standard Form) I need that into ordinary number.
9.1 X 10^3 (standard Form) I need that into ordinary number.
7.3 X 10^2 (standard Form) I need that into ordinary number.

Click here to see answer by Alan3354(69443)

Question 1052876: If y=13, which one of the following expressions will produce a value of 4?
y+14
24�y
3y−1
12y

Click here to see answer by Alan3354(69443)

Question 1052911: 9.1 * 10^-3 (standard form) I need help putting that into a ordinary number.
Click here to see answer by josgarithmetic(39617)

Question 1052911: 9.1 * 10^-3 (standard form) I need help putting that into a ordinary number.
Click here to see answer by Alan3354(69443)

Question 1052968: The monthly cost (in dollars) of water use is a linear function of the amount of water used (in hundreds of cubic feet, HCF). The cost for using
16
HCF of water is
$31.47
, and the cost for using
35
HCF is
$64.72
. What is the cost for using
25
HCF of water?
WaterusageinHCF
Monthlycostindollars

Click here to see answer by josgarithmetic(39617)

Question 1053013: How many solution does y=3x+2 have
Click here to see answer by Alan3354(69443)

Question 1053058: 2x-4y+2z=6
x-5y-5z=3
2x+y+4z=-2
Click here to see answer by Alan3354(69443)

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