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

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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 jackytavares(5)

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(4667)

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(1276)

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(4667)

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(1276)

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(4667)

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(6287)

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(1276)

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)

Question 51871: I am an adult just going to college for the first time. I am having a difficult time learning algebra since this was not required when I was in high school. I do not have a textbook b/c I am doing my class through mymathlab and you can pull up the textbook pages on there. Could you please help me solve this problem?
-1/6(x-18)+1/3(x+3)=x+4
Thank you very much for your time
Patty Scott
Click here to see answer by funmath(2925)

Question 51988: Find the x intercepts.
y=x^2-9x+20
Click here to see answer by THANApHD(104)

Question 52025: Hi, I have to suppose the vertex of the parabola y=3x^2-6x+k is (1,2) I have to find k.
I have substituted x=1 and y=2 into the equation and got
2=3(1)^2 - 6(1) +k
2= 3-6+k
2-3+6=k
k=5
Is this right??? thanks.
Click here to see answer by rapaljer(4667)

Question 52024: Hi, I have to find the vertex and axis of symmetry of the parabola
y= -x^2+6x+3
I also have to find if it opens upward or downward. I have done this so far:
a= -1 b=6 c=3
Vertex occurs when x= -b\2a = -6\2(-1) = 3
Then y=f(3)= -1(3)^2+6(3)+3
=12
Vertex (3,12).
It is downward because a<0
I am not sure on the axis of symmetry and how to work it out.
greatly appreciated if you could please help

Click here to see answer by rapaljer(4667)

Question 52138: To Whom It May Concern:
I have beeen having problems with algebra II every since i started and most of the time i just don't get the problems. Righ now in class we are doing something called Linear Equations and somethong that has to do with systems. So can you please just give me the easest way possible to understand these type of problems because sometimes it gets fustrating.
Sincerly,
Daniel Whitaker
Click here to see answer by josmiceli(9664)

Question 52215: Solve the system. Enter the solution coordinates.
2x - 4y = 7
4x + 2y = 9
Click here to see answer by funmath(2925)

Question 52247: solve each sytem by graphing.
x + y = 6
x - y = 2
Click here to see answer by scoop(27)

Question 52245: Could you help me to better understand how to graph linear equations in two variables? In simple easy to understand terms.
1. 2x + 3y = 12
this is my solution
2(0) + 3y =12
0 + 3y/3 = 12/3
y = 4
x = 0
2. x-y = 2

Click here to see answer by rchill(405)

Question 52237: How do you find the equation of a line satisfying the given conditions: perpendicular to x=2 and passing through the point (3,4)?
Click here to see answer by rapaljer(4667)

Question 52236: How do you find the equation of a line satisfying the given conditions: Vertical line passing through (2,-7)?
Click here to see answer by rapaljer(4667)

Question 52235: How can you find the slope-intercept form of the line perpendicular to y=-3x, passing through the point (o,-3)?
Click here to see answer by THANApHD(104)

Question 52478: Hi,

We did linear equations last week in class, and now we've moved on to graphing, but I can't do my homework because I still don't understand the linear equations yet!

On the blackboard, our teacher explained that the answer to:

x + 2y = 0

is

y = -1/2x

If someone could explain how our teacher got to that answer, I'd REALLY appreciate it!!

Also, the book we're using said to just guess a number for x, and then figure out y... does that mean everyone will get a different answer?

Thanks,
~ Jasmine

Click here to see answer by checkley71(8403)

Question 52234: How can you find the slope-intercept form of the line perpendicular to y=-3x, passing through the point (o,-3)?
Click here to see answer by darq(90)

Question 52512: Write the equation in standard from for the line that contains the given point with the given slope.
(1,0); m=3
Click here to see answer by darq(90)

Question 52513: Find an equation in standard from for each line that satisfies the given conditions.
Parallel to the x-axis and passes through (-1,3)
Click here to see answer by darq(90)

Question 52548: 5x+10-6x+3=6-2x-2
Click here to see answer by checkley71(8403)

Question 52523: A line is passing through the points (-1,1) adn (-2,-1).
What is the lope and what is the equation of the line and what are the x and y intercepts?
Click here to see answer by checkley71(8403)

Question 52572: In class we are working on reviewing writing linear equations. i know how to solve or write an equation when i have a slope and a point, and i also know how to solve when i have two points. My teacher however forgot to give us notes on how to solve when they give us an x-intercept and a y-intercept. For example:
x-intercept=3, y-intercept=2.
Could you please help me?

Click here to see answer by Nate(3500)

Question 52676: Can you help me in solving for (k) so that it can have many solution.
2x + ky = 3
-x + 5y = -6
This is what I have don
2x = 3-ky
x=3/2-ky/2
Click here to see answer by Edwin McCravy(8891)

Question 52676: Can you help me in solving for (k) so that it can have many solution.
2x + ky = 3
-x + 5y = -6
This is what I have don
2x = 3-ky
x=3/2-ky/2
Click here to see answer by venugopalramana(3286)

Question 52654: Determine if each of the following is a relation or a function. Tell why and give the domain and range of each one.
a) (0,1)(4,1)(6,2)(2,0)
b) y=6 over 2x-1
Click here to see answer by funmath(2925)

Question 52885: Solve the system of equations: (hint: let (1/x)=t and (1/y)=u)
(2/x)+(1/y)=11
(3/x)-(5/y)=10
Click here to see answer by funmath(2925)

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