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

Tutors Answer Your Questions about Linear-systems (FREE)

Question 31266: 6+3x-4-x
Click here to see answer by brianunlv(12)

Question 31149: Use elimination to solve:
3x-y=6
x-2y=-2
Click here to see answer by checkley71(8403)

Question 31157: Please help me solve this linear equation.
Determine the slope of the line through each pair of points below.
a. (3,5); (8,9)

b. (-4,1); (2,3)

c.(7,5); (7, -3)

an answer to just one of them with an explanation of how to solve it would be helpful. :)
Click here to see answer by stanbon(57967)

Question 31421: Find the slope and the y-intercept of the equation 2x-9y+1=0
I already changed the equation to 2x+1=9y but I'm not sure if this is right or where to go from here.
Click here to see answer by stanbon(57967)

Question 31500: One number is three less than another. Their sum is fifteen. Find the numbers

Click here to see answer by mbarugel(146)

Question 31822: I need to find an equation of the line satisfying the given condtion
Through (4,2); m= -2/3
Click here to see answer by benni1013(197)

Question 31823: Write an equation in standard form for a line passing through the pair of points
(0,6) and (3,-5)
Click here to see answer by elima(1433)

Question 31977: How can i solve this by using the substitution method?
x=(1/5)y
3x+2y=26
Click here to see answer by stanbon(57967)

Question 32047: how can i solve this equation by substitution:
x+2y=7
y=3x
Click here to see answer by mukhopadhyay(490)

Question 31976: Need some help soving this by graphing.
(Systems of linear equations)
3x+y=5
-2x+3y=4

Click here to see answer by mukhopadhyay(490)

Question 32186: How can i solve this by the substitution method?
2M=N-3
3M=2N-9
Click here to see answer by checkley71(8403)

Question 32392: How can I solve the equations: 3x+y=3, 7x+2y=1
Click here to see answer by mukhopadhyay(490)

Question 31599: a+b+c=100
a+10b+50c=500
Click here to see answer by checkley71(8403)

Question 32601: how do you work out this problem?
{2x+10y=-2
{6x+4y=20
Click here to see answer by checkley71(8403)

Question 32793: please help
-6x - 5y = 20
-y = 6x + 4
Click here to see answer by stanbon(57967)

Question 32822: Solve the equation.
1. 3a^2=-a+2
2. 3(x-3)=2(6-x)

I am having alot of trouble with these three problems. I got x=-9 for problem two. I need for somebody to show me the steps so that I can understand them for the test. These questions do not come from a book they are comming from a review sheet. I know there is only one submission per day but I really need help on these three problms. Thanks hope you can help.
Click here to see answer by stanbon(57967)

Question 32831: This question must be written in two unknowns for each problem and then solved each system by substitution.
The question: tickets for a concert were sold to adults for $3 and to students for $2. If the total receipts were $824 and twice as many adult tickets were sold, then how many of each were sold?
I have been trying to do what the book says, but it is not helping.
What I have tried:
a=adults & s=students
$824=total of tickets
I got 204 adult tickets sold =$612
106 student tickets sold =$212
this provides the number of tickets sold of each, but I got that by deduction.
I am unsure of how to do the two equations and then solve them by substitution.
I Need help DESPERATLEY Thank you!

Click here to see answer by kietra(57)

Question 31824: Ineed to find the x and y intercepts of the graph of the equation
5x + y = 10
Click here to see answer by sarah_adam(201)

Question 33052: Would someone check to see if I did this correctly? Thank you in advance
Solve for x:
2(x + 1) > 12

Simplify left side and right side to get:
2x + 1=12-3
2 + 1 + x = 12
x = 9

Click here to see answer by babyblue87(3)

Question 31610: Simultaneous Solution of Systems of Linear Equations
3/5x + 3/8y + 800 = x
6/10 + 2/5y + 1300 = y
How do I find the simultaneous solution to the above equation?
Your help will be most welcomed. I have been searching for a week now to this problem.
Lynn
Click here to see answer by checkley71(8403)

Question 33332: PLEASE HELP!
GRAPH TO FIND THE SOLUTION:
x-y=6
2x-2y=-6
I have tried it myself and I think If I am correct I have no slution for teh system. Can you please confirm this answer for me?
Thanks in advance.
Click here to see answer by stanbon(57967)

Question 33348: I need to solve this system of linear equations and I am having a hard time. Please help.
x-3y+2z =-11
2x-4y+3z =-15
3x-5y-4z =5
Click here to see answer by mukhopadhyay(490)

Question 33348: I need to solve this system of linear equations and I am having a hard time. Please help.
x-3y+2z =-11
2x-4y+3z =-15
3x-5y-4z =5
Click here to see answer by sarah_adam(201)

Question 31028: What must be true about x, y, z and w if AB = BA for the matrices
A=
x y
z w
B=
1 1
-1 1
Click here to see answer by venugopalramana(3286)

Question 33683: I'm not exactly sure what category this question belongs in, but here it is:
A train leaves Smithville and travels south at a speed of 60 mph. Three hours later, a second train leaves on a parallel track and travels south at a speed of 90 mph. How far from the station will the second train overtake the first train?
Click here to see answer by mukhopadhyay(490)

Question 33800: [1,1] [0,3]
2x+y=3
Click here to see answer by fanism(39)

Question 34068: how do u solve y=x-1
2x-y=0

Click here to see answer by fanism(39)

Question 34053: x+y=6
x-y=12
Click here to see answer by algebrapro18(206)

Question 34070: how do you solve this problem:
y=2x-8
x=y+4
this problem is making me go mad!!!!
HELP ME PLEASE!!!!!!!!!!
Click here to see answer by algebrapro18(206)

Question 34070: how do you solve this problem:
y=2x-8
x=y+4
this problem is making me go mad!!!!
HELP ME PLEASE!!!!!!!!!!
Click here to see answer by fanism(39)

Question 34229: Solve the system by the substitution method.

x - 3y = 25
-6x - 4y =-18
Click here to see answer by kietra(57)

Question 34306: x+y=10
2x-y=-1
Click here to see answer by priya(51)

Question 34304: x-y=-8
x+y=12
Click here to see answer by priya(51)

Question 34400: 2/3{9n-6}=4{n+1}
Click here to see answer by askmemath(368)

Question 34402: I need to find the slope of a line parallel to each line.
1.y=2x-3 2.8y=-7x+16
Click here to see answer by checkley71(8403)

Question 34401: I need to find the solpe of a line parallel to each line.
1.y=2x-3
Click here to see answer by mukhopadhyay(490)

Question 34401: I need to find the solpe of a line parallel to each line.
1.y=2x-3
Click here to see answer by checkley71(8403)

Question 34423: find the equation of the line passing through the point (-2,-1) and parallel to the line 2x+5y=10
Click here to see answer by mukhopadhyay(490)

Question 34481: Solve by substitution:
3x - y = 5
y = 3x - 5
Click here to see answer by stanbon(57967)

Question 34480: Solve by substitution:
3x - y = 5
y = 3x - 5
Click here to see answer by stanbon(57967)

Question 29941: Hi, I have been assigneda rather large piece of homework that is mostly easy, however it does contain one question that is baffling me. I have asked about 5 other people about it before coming here, it is as follows.
John takes a test. He ets 2 points for each right answer and loses 1 point for each one wrong.
Write an equation that he did all 50 problems.
Write an equation showing how he got 40 points
And
Graph out both equations and explain what the point of intersection means.
I have no idea how or where to start on this, and neither do any of my friends or family. Please Help!
Click here to see answer by stanbon(57967)

Question 34478: Solve by substitution:
3x + 2y =27
x= y + 4
Click here to see answer by lyra(94)

Question 34476: Solve by substitution:
x+y=12
y=3x
Click here to see answer by Prithwis(166)

Question 34477: Solve by substitution:
x+3y=-25
y=-5x
Click here to see answer by Prithwis(166)

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