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

Tutors Answer Your Questions about Linear-systems (FREE)

Question 49731: Please...I need help solving the following system by graphing
x-2y=8
3x-2y=12
Click here to see answer by AnlytcPhil(1806)

Question 49730: I need help really badly in solving the following system by graphing.
2x - y =4
2x - y =6
I do not know the steps needed to complete this or graph it.
Click here to see answer by checkley71(8403)

Question 49834: 1/(x-1)(x-2)+1/(x-2)(x-3)+1/(x-3)(x-4)= 1/6
Click here to see answer by alka(15)

Question 49497: 6x-1 over 5, minus, 2x over 3, equals 3. I am solving for x. I tried using the LCM of 15 but every answer I come up with doesn't equal out.
Click here to see answer by Juhi(44)

Question 49446: Can someone help me on this problem?
I need to solve and check the following equation:
12x - 6 = 11x
Thanks, Sher
Click here to see answer by Juhi(44)

Question 49889: How do I solve these problems?Please show me step by step.

2x + 3y=6 (solve for y)

2x -6y +12=0 (solve for y)
Click here to see answer by stanbon(75887)

Question 49978: Solve the system by addition.
5x � 3y = 13
4x � 3y = 11

Click here to see answer by stanbon(75887)

Question 49979: Solve the system by addition or substitution.

3x + 6y = 0
x=2/3

Click here to see answer by stanbon(75887)

Question 50102: Hi, this question has me confused. It is suppose that the vertex of the parabola is y=3x^2-6x+k is (1,2). Find k.
Do I replace y with 2 and the x with 1 and come to a conclusion from there??? I'm not sure. Thanks.

Click here to see answer by stanbon(75887)

Question 50099: Well I will start off saying I know I have the wrong answer somewhere and I know that because I put my answers into the original equations and they don't work. I have trouble when you throw that third variable in so if someone can tell what is right (if anything) and where I went wrong. Thanks!! Andrea
(a)
2x � y + z = 8
x + 2y + z = -3
x - 2y � z = 7
(1 & 3)
3x � 3y = 15
x � y = 5
2x = 4
x = 2
2 � y = 5
y = -3
2 + 2(-3) + z = -3
z = 1
(b)
3x - y - 2z = 11
x � 2y + 3z = 12
x + y - 2z = 5
(1 & 3) = (4)
4x � 4z = 16
(2 & 3) = (5)
x � 2y + 3z = 12
2x + 2y � 4z = 10
3x + z = 22
(4 & 5)
4x � 4z = 16
3x + z = 22
4x � 4z = 16
-12x + 4z = -88
-8x = -72
x = 9
3(9) + z = 22
27 + z = 22
z = -5
9 � y � 2(-5) = 5
9 � y + 10 = 5
19 � y = 5
-y = -14
y = 14
Click here to see answer by Earlsdon(6294)

Question 50039: PLEASE HELP ME!!!
I need to find out the intercepts for x and y. i need the cordinants for them. for example, the integers of x is (#,0) and the integers of y is (0,#). well my problem to find out is what is the integers of 4x-y=3? please help me all you can, i really need to pass this class and i just dont get it.
Click here to see answer by tutorcecilia(2152)

Question 50191: Jo as 37 coins(all nickles, dimes, and quarters) worth $5.50. She has 4 more quaters than nickles. How many dimes does Jo have?
Click here to see answer by stanbon(75887)

Question 50182: I tried to use the solver on this website
(SOLVE linear system by SUBSTITUTION)
and I could not work this kind of problem. Do not know what I am doing wrong.
8x-4y=16
y=2x-4
can someone please help???
Click here to see answer by junior403(76)

Question 50183: tried to use the linear system solver and cannot figure it out. Keeps telling me there is an error.
Please help solve the system by substitution.
4x-12y=5
-x+3y=-1
Click here to see answer by junior403(76)

Question 50247: What property of equality is being used in this problem?
If x-2=3, then (x-2)+2=3+2
Click here to see answer by stanbon(75887)

Question 50291: I am trying to solve the following system by using addition or substitution. If a unique solution does not exist, state whether the system is dependent or inconsistent.
I am unable to work this out. Can someone please help me?
10x+2y=7
y=-5x+3
Click here to see answer by junior403(76)

Question 50378: can you show me the detailed steps for solving for x in the following equation?
2.15x + 2.55*(1-x)=2.516
I can get as far as:
x=2.516-2.55*(1-x)/2.15
but I am unsure how to complete from there.
Thank you in advance for your help.
Scott
Click here to see answer by stanbon(75887)

Question 50382: 27% of 350= 12% of 8= 7% of 350=
Click here to see answer by tutorcecilia(2152)

Question 50380: joe needs 4 pieces of lumber each 6 and 7/8 inches long . how much lumber does joe need
Click here to see answer by tutorcecilia(2152)

Question 50384: Solve xyz=x + y + z for z
Click here to see answer by stanbon(75887)

Question 50385: matching
2y - 3 monomial
4 3 2
8m +6m -3m +7m-8 binomial

2
-26p s trinomial
7x + 3y-6z polynomial
Click here to see answer by stanbon(75887)

Question 50383: 27% of 350= 12% of 8= 7% of 350=
Click here to see answer by stanbon(75887)

Question 50379: ellen wants to make curtains for her kitchen.each panel takes 67and 3/4 inches of material.how many inches of material will she need if shs has three windows and each needs two panels? 3 windows with 2 panels=6 panels
Click here to see answer by tutorcecilia(2152)

Question 50493: 2x-5=y
3y-6x=20
I used the substitution method and got
3(2x-5)-6x=20
6x-15-6x=20
-15=20
no solution
Cany someone tell me if this is correct? Thanks
Click here to see answer by tutorcecilia(2152)

Question 50672: Can someone please tell me:
Which label describes the following?
3x + 6 = 10
Expression?
Linear equation?
Equation which is not linear?
Click here to see answer by rapaljer(4671)

Question 50673: I tried to use the substitution solvers and could not figure this out.

Solve the system by substitution.
x + y = 12
y = 2x

Click here to see answer by venugopalramana(3286)

Question 50676: I need help solving:
Solve the system by addition or substitution.
3x + 6y = 0
x=2/3
Click here to see answer by venugopalramana(3286)

Question 50628: Hello-
I am doing a review on algebra 1 and I am in need of some help.
This is the problem that I need help on:
"Write the equation of line AC, passing through A(1,4) and C (3,6)."
Thank you if you can help!
Click here to see answer by venugopalramana(3286)

Question 50689: 1.9/3+3a/4=13/3
2.5x-2/3=8-3x/5
3.b-2/b+4=b+1/b+10
4.5y-1/2-3y+5=7y+13/6
Click here to see answer by AnlytcPhil(1806)

Question 50889: 400 tickets sold, students $2.00, adults $3.00. Took in $1050.00 How many of each sold?
I think the equation is $2.00x+$3.00=$1050.00
x+y=400
Click here to see answer by Nate(3500)

Question 50913: Hi, I have to determine the linear function f(t) with slope -1 and f(2)= -1.
I have done slope -1 and (2, -1).
form f(x) =ax+b
a= -1
f(x) = -1
Since f(2)=1
f(2)= -1(2)+b
2=-2+b
2+2=b
4=b
f(t) = -1t+4
Is this even remotely on the right track??
thanks for your time!
Click here to see answer by rapaljer(4671)

Question 50979: How do I solve this equation? -3x+b=6x,for x
Click here to see answer by tutorcecilia(2152)

Question 50979: How do I solve this equation? -3x+b=6x,for x
Click here to see answer by checkley71(8403)

Question 51043: solve x+1/3+x+6/7=1
Click here to see answer by checkley71(8403)

Question 51076: Please use the Gauss-Jordan method to solve system of equations
23. 6x-3y = 1
-12x-6y= -2
I thought this one is no solution but the answer (back of the book) is ((23y + 1)/6,y). Why?
29. 4x+4y-4z = 24
2x-y+z =-9
x-2y+3z = 1
Thanks.

Click here to see answer by AnlytcPhil(1806)

Question 51145: Find the value of k so that the point P lies on line L.
P(2,1), L: 3x + ky= 8
Click here to see answer by THANApHD(104)

Question 51233: Exercise 2.2 #19 on page 97
Solve the system for p and q in terms of x and y. Explain how you could check your solution and perform the check.
x=2+p-2q
y=3-p+3q
I've been all over the chapter and couldn't find anything remotely helpful for this. Please help!!!
Click here to see answer by rapaljer(4671)

Question 51170: how does the graphfor the following equations look? y=x-1/2 and y=3x+1
Click here to see answer by Earlsdon(6294)

Question 51415: the similtanious equation graph for y=x+4 and y=2x+2
Click here to see answer by rchill(405)

Question 51650: What is the answer to x=4 and 2x-3y=-19
Click here to see answer by rchill(405)

Question 51801: how do i do these kinds of problems x/5-9=3 i dont get this stuff !
Click here to see answer by Nate(3500)

Question 51803: Hi I am really having a hard time with this problem. We are learning about polynomials and the problem is:
Solve for X
the solution will be AN EXPRESSION WITH a and or b in it
x+2a=3x-a
answer will be 3a/2
Click here to see answer by Nate(3500)

Question 51887: problem solving using two variables.
The sum of two integers is 51.The larger integer is 3 more than twice the smaller integer.Find the integers?
Click here to see answer by AnlytcPhil(1806)

Question 51886: rellie invests 12,000 pesos. A part of it earns 10% interrest annually ans the rest earns 9% interest annually. his annual income from these investments is 1, 130 pesos. how much is invested at each rate?
Click here to see answer by tutorcecilia(2152)

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