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

Tutors Answer Your Questions about Linear-systems (FREE)

Question 1016886: x+y+z=-2
2x+5y+2z=-1
-x+6y-3z=3
Click here to see answer by Alan3354(69443)

Question 1016859: 1/(3x) + 1/(2y) + 1/(2z) = -1
1/(5x) - 1/(3y) + 1/(4z) = -1/3
1/(2x) + 1/y + 1/(2z) = -1/2

Click here to see answer by Alan3354(69443)

Question 1016914: Solve x-y=1and x+2y=7

Click here to see answer by Cromlix(4381)

Question 1016927: Solve graphically x-y=1and x+2y=7 solve simultaneously in linear equation
Click here to see answer by macston(5194)

Question 1017018: . Solve the following system of equations using Gauss-Jordan elimination. Show all your steps.
2x − 4y + 6z = 2
4x − 8y + 12z = 5
3x − 6y + 9z = 3

Click here to see answer by Theo(13342)

Question 1017017: Solve the following system of equations using
Gauss-Jordan elimination. Show all your steps.
x + 2y + 3z = 1
y + 4z = 2
−x + y + z = 3
Click here to see answer by Edwin McCravy(20056)

Question 1017104: I am taking Algebra in College and I'm having a hard time trying to figure out how to solve systems of linear equations by graphing. For example,
2x+y=2
6x+-3y-9
Thanks,
Shelly
Click here to see answer by stanbon(75887)

Question 1017132: Howare linaear equations used in real world
Click here to see answer by fractalier(6550)

Question 1017182: The difference between the triple of a number and a quarter of another number is 13 and the other is double the first number plus twice the second is 18. Find the numbers
Click here to see answer by Theo(13342)

Question 1017405: Find f '(x) if f(x) = x^2-3x

Click here to see answer by fractalier(6550)

Question 1017413: Is f(x) = |x| differentiable at x=0? Why?

Click here to see answer by fractalier(6550)

Question 1017412: Find the derivative of f(x)=5x evaluated at x=2.

Click here to see answer by fractalier(6550)

Question 1017518: Could you please help me solve this system of linear equations?
It's -2x+y=1.3 and 2(0.5x-y)=4.6
Click here to see answer by Cromlix(4381)

Question 1017602: Solve the following linear system.
13y = 20x + 3y
13y + ( 8x + y ) = 180
Click here to see answer by FrankM(1040)

Question 1017858: (2x+7y)(2x+5y)
Click here to see answer by Fombitz(32388)

Question 1018231: Y=x^2
Click here to see answer by Alan3354(69443)

Question 1018300: Is (9, 1) a solution to this system of equations?
x + 3y = 12
18x + 16y = 9
yes
no
Submit

Click here to see answer by t0hierry(194)

Question 1018385: find the value of x
0=9(3x+7)-5(x+2)-(2x-5)
Click here to see answer by Cromlix(4381)

Question 1018421: Hello, I would appreciate any help you could give me with the following word problem/inverse variation. It takes 7 hrs for Mary to rake leaves by herself, but her brother Matt can work three times as fast. If they work together, how long will it take them to rake leaves. I have a chart to complete with rate, time and work done for each sibling. I have Mary: rate 1/7, time 7, work done, 1. Matt: rate 3/7, time 3, and /work done 1. together rate is 1/7 +3/7=4/7=7/4= 1.75 or 1 hour and 45 minutes. Thank you!
Click here to see answer by josmiceli(19441)

Question 1018518: Stuck on this one any help would be appreciated!
If -4(x-1)=y^2 and 1=(((x-4)^2)/9)+((y^2)/4), how many solutions does this system have?
Answer is 1 solution
Click here to see answer by Alan3354(69443)

Question 1018559: a+b=20
5a+9b=120
solve for b
Click here to see answer by Boreal(15235)

Question 1018552: solve by any method
9x=-22+7y
-4x+2y=2
Click here to see answer by Boreal(15235)

Question 1018567: 3u+z=15
U+2z=10
Click here to see answer by FrankM(1040)

Question 1018567: 3u+z=15
U+2z=10
Click here to see answer by ikleyn(52785)

Question 1018593: 5x+71y=100------(1)

x+45y=63---------(2)
Click here to see answer by Alan3354(69443)

Question 1018528: Hi how can i solve this coconuts and Monkey problem?
1
▼
Five sailors arrive at a deserted island that has only coconuts and one monkey. The sailors collect all the coconuts into one big pile and agree to divide up the coconuts into equal shares the next morning. However during the night each sailor wakes up one at a time afraid to trust the others and decides to take his share secretly. So each sailor takes 1/5 of the coconuts and hides it. Each time there is one coconut left over and the sailor gives that to the monkey. In the morning they divide what is left of the pile into equal shares and there is still one coconut left for the monkey..
How many were in original pile?
I know you need to use diophantine equation but other than that its really challenging for me..
Click here to see answer by richard1234(7193)

Question 1018612: The area of a circle of radius r is given by the polynomial pie r^2. Where pie is an irrational number. Use 3.14 as an approximation of pie, and find the area of a circle with radius 3 cm
Click here to see answer by ikleyn(52785)

Question 1018643: please divide and show work to solve x^2-11/x-4
Click here to see answer by fractalier(6550)

Question 1018753: 15=6y+3

Click here to see answer by Myth21(1)

Question 1018827: Enter the value for x that makes the equation �2x � 1.5(4 � x) = 20 � 3x true.

Click here to see answer by Boreal(15235)

Question 1018850: (-3x3y)(?)=18x9y4 can you help me solve it please
Click here to see answer by Alan3354(69443)

Question 1018989: Find all solutions to each of the following diophantine equations?
11x+3y=1
i got x=-1+4n
and y=4-1n
the answer say im wrong?
Click here to see answer by josgarithmetic(39617)

Question 1019011: 7=2+y

Click here to see answer by Alan3354(69443)

Question 1018981: What are some ways of solving Diophantine equation?
Click here to see answer by ikleyn(52785)

Question 1018981: What are some ways of solving Diophantine equation?
Click here to see answer by fractalier(6550)

Question 1019108: -6x + 7y = -47
15x - 13y = 122
=============
Multiply the 1st eqn by 5 and the 2nd by 2, then add them.
Click here to see answer by Alan3354(69443)

Question 1019120: HOW can I get this equation to y=mx+b form so I can see the slope clearly?
2x+6y=-3
Click here to see answer by Alan3354(69443)

Question 1019206: Substitution
X+2y=5
Click here to see answer by Alan3354(69443)

Question 1019249: X+3y=10
-3x+y=-10
Click here to see answer by Cromlix(4381)

Question 1019346: For my homework assignment, I had to do this problem:
You sold hats and t-shirts at a recent ball game. Hats sold for $10.50 each and t-shirts sold for $16.75 each. You sold a total of 35 items and earned $492.50. How many hats and how many t-shirts did you sell?
I tried to do this equation:
10.50x+16.75y=35
x + y= 492.50
I tried to solve the equation but when I canceled out the variable I subtract the 35 and 492.50 I couldn't solve the problem. I really have no clue how to solve this.
Click here to see answer by josgarithmetic(39617)

Question 1019797: -x+y=7
X+y=5
The solution system is?
Click here to see answer by ikleyn(52785)

Question 1019803: 2a+8b=22
- 2a + b = 5
help please I don't know how to get this to make sense
Click here to see answer by josgarithmetic(39617)

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