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

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Question 450364: solve by elimination
2c - 3d = 14
5c - 6d = 32
Click here to see answer by stanbon(75887)

Question 450371: solve by elimination
4x + 4y = 5
2x - 8y = -5
Click here to see answer by mananth(16946)

Question 450454: q=a+b+c. solve for a
Click here to see answer by algebrahouse.com(1659)

Question 450875: five-sixths of a number is-60. What is the number?
Click here to see answer by jorel1380(3719)

Question 450936: I am having a hard time figuring out (a).. I have no idea how to set it up and solve- any help would be much appreciated!!!!

In 2004, there were an estimated 39 million HIV infections worldwide with an annual infection rate of 4.9 million.

a. Find the slope intersect form of a line that approximates the cumulative number of HIV infections in million during year X, where X ≥ 2004.
b. Estimate the number of HIV infections in 2010.
Click here to see answer by jorel1380(3719)

Question 450366: solve by elimination
a - 2b = -3
-2a + 4b = 6
Click here to see answer by robertb(5830)

Question 451252: 2. -8x-3y=69
8x+7y=-65
how do you solve step by step to find the two points
Click here to see answer by Alan3354(69443)

Question 451252: 2. -8x-3y=69
8x+7y=-65
how do you solve step by step to find the two points
Click here to see answer by htmentor(1343)

Question 450732: which of the following is the solution to the equation 2(x-10)=3x-4?
a.) 1
b.) -1
c.) -6
d.) -16
Click here to see answer by Edwin McCravy(20056)

Question 451494: Please help. I need to find four solutions of the equation. Write the solutions as ordered pairs..y=-3x-6 Multiple choice start with (-4,6) Thank you.
Click here to see answer by stanbon(75887)

Question 451552: 2x+3y=10 , find the value of x and y.
Click here to see answer by confusedgirl81(14)

Question 451640: what is the answer to this problem:
2x-3y+2z=3
2y-3z=-6
z=4

Click here to see answer by ewatrrr(24785)

Question 451662: Consider the following formula: y=3(x+5)(x-2)
Which of the following formulas is equivalent to this one?
(2) means square. (I did not know how to make the computer make the 2 square)
A. y=3x(2)+9x-30
B. y=3x(2)+3x-10
C. y=3x(2)+3x-30
D. y=3x(2)+3x-30
Click here to see answer by ewatrrr(24785)

Question 451710: What type of solution does the following linear system have?
Click here to see answer by ewatrrr(24785)

Question 451781: A cycle shop sells bicycles and tricycles. The number of bicycles is 1 less than 4 times the numberm of tricycles. All the bicycles and tricycles together have 174 wheels. How many bicycles are there?
Click here to see answer by pedjajov(51)

Question 452229: x-y=-9
Click here to see answer by Alan3354(69443)

Question 452201: Solve the following system of equations.
x+2y=5
x=8-2y

What is the solution of the system. Type an ordered pair.
Click here to see answer by rwm(914)

Question 452310: Solve by substitution.
6m+n=52
m-5n=19
Thank you,
Missy
Click here to see answer by Alan3354(69443)

Question 452308: Solve by substitution method.
5x-8y=9
9x+91=y
Thank you,
Missy
Click here to see answer by Alan3354(69443)

Question 452313: Soybean meal is 14% protein; cornmeal is 7% protein. How many pounds of each should be mixed together in order to get 280lb mixture that is 13% protein?
How many pounds of the cornmeal should be in mixture?
How many pounds of the soybean meal should be in mixture?
Thank you,
Missy
Click here to see answer by ankor@dixie-net.com(22740)

Question 452320: 0.3x-0.2y=4
0.2x+0.3y=-37/17
Solve by elimination.
Thank you,
Missy
Click here to see answer by ankor@dixie-net.com(22740)

Question 436488: Lifting weights can increase a
person�s muscle mass. Each additional pound of
muscle burns an extra 40 calories per day. Write a
linear function that models the number of calories
burned each day by x pounds of muscle. By burning
an extra 3500 calories a person can lose
1 pound of fat. How many pounds of muscle are
needed to burn 1 pound of fat in 30 days?
I have the formula of : f(x)= ax + b
I am not sure where to start?
Click here to see answer by ebmcalle(1)

Question 452978: one canned juice drink is 15% orange juice; another is 5% orange juice. How many liters of each should be mixed together in order to get 10L that is 7% orange juice?
Click here to see answer by mananth(16946)

Question 452825: y=-x+3
y=x+1
solve by using substitutions

Click here to see answer by Love math(28)

Question 453083: five years ago,neeta was thrice as old as geeta.ten years later ,neeta will be twice as old as geeta.how old are neeta and geeta now?
Click here to see answer by ankor@dixie-net.com(22740)

Question 453270: x - 3% = $970. What is x?

Click here to see answer by Alan3354(69443)

Question 453557: I'm trying to solve this system of equations by graphing:
5x+ y=32
6x+ 7=-8
What is the ordered pair?
Click here to see answer by edjones(8007)

Question 453569: The sum of 2 numbers is 26 and the difference is 10. Help me how to solve the Linear Equations, please.
Click here to see answer by edjones(8007)

Question 453569: The sum of 2 numbers is 26 and the difference is 10. Help me how to solve the Linear Equations, please.
Click here to see answer by solver91311(24713)

Question 453618: How do I solve a linear equation if the y is listed first? For example
-4Y-3x=-4
Click here to see answer by rfer(16322)

Question 453745: Please help me with this question!
y=-x+4
x+2y=12
Click here to see answer by mananth(16946)

Question 453853: slope:2/5
y-intercept:-3
Write the equation of the line given the following information.
Click here to see answer by confusedgirl81(14)

Question 453883: subtract 9 from a certain number gives a result of 7
Click here to see answer by algebrahouse.com(1659)

Question 453887: when a certain number is subtracted from 14, the answer is -3
Click here to see answer by algebrahouse.com(1659)

Question 453911: Use the substitution method to solve the following system of equation
2x-9y=1
x-4y=9
Click here to see answer by algebrahouse.com(1659)

Question 454058: using the graphing method how would you solve this
3x+6y=18
2x+5y=20

Click here to see answer by Alan3354(69443)

Question 454226: how do I Find an equation of the line satisfying the conditions given. Express your answer in standard form. Parallel to 3x � y = -5 and passing through (-1, 0)
Click here to see answer by stanbon(75887)

Question 454260: use substitution method to determine whether the system of linear equations has no solution, one solution,or many solutions
x + 2y = 0
y = - 1/2x
Click here to see answer by robertb(5830)

Question 454259: use substitution method to determine whether the system of linear equations has no solution, one solution,or many solutions
2x - y = 8
x + 4y = 13
Click here to see answer by mananth(16946)

Question 454255: solve using elimination method
x+8y=31
2x+7y=35
Click here to see answer by mananth(16946)

Question 454254: solve using elimination method
x+3y=-20
4x+3y=-17
Click here to see answer by mananth(16946)

Question 454219: Solve using the elimination method. Show your work. If the system has no solution or an infinite number of solutions, state this.
4x + 3y = -45.5
-5x + 8y = -43
Click here to see answer by mananth(16946)

Question 454258: solve using substitution method
x - 5y = 17
-5x - 6y = 8
Click here to see answer by mananth(16946)

Question 454404: Determine how many solutions exist, and use either elimination or substitution to find the solutions (if any).

x + y = 3 and y = x + 3
Click here to see answer by mananth(16946)

Question 454615: a farmer has 7 3/4 rows of radishes in one field,4 3/4 rows of radishes in another field,and 6 1/4 rows of radishes in the third field.how many rows of radishes does he have altogether?

Click here to see answer by rfer(16322)

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