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

Tutors Answer Your Questions about Linear-systems (FREE)

Question 712914: x+y=19
x-y=-7
Click here to see answer by checkley79(3341)

Question 712895: 2x-y+-3
x+y=9
Please Use Substitution method
Click here to see answer by checkley79(3341)

Question 712974: what do you get when you multiply 2x by -1
Click here to see answer by stanbon(75887)

Question 712977: A = L x W
= 7.5x(6x-6)
= ?
Can somebody please tell me the answer?
The answer has to be a polynomial expression.
Click here to see answer by Alan3354(69443)

Question 713231: In 2007 Person A's stock portfolio decreased in value by 20%. In 2008 his stock portfolio decreased in value by another 40%. What percentage gain is required in 2009 for person A's stock portfolio to return to the value it had at the beginning of 2007? round the answer to nearest tenth as needed
Click here to see answer by stanbon(75887)

Question 713234: Bill invests in a plan that has an interest rate of 2%. He invests two times as much in a plan that has an interest rate of 3%. If the total interest from the investments is $ 336 after one year how much was invested in each plan?
Click here to see answer by stanbon(75887)

Question 713304: Mrs. Bieber bought 15 tickets to movie and spent $200. she bought a combination of child tickets for $4 each and adult tickets for $12 each. write a system of equations determine the number of adult tickets, a, and the number of child tickets, c, she bought
Click here to see answer by checkley79(3341)

Question 713297: So, I was doing pretty good in my math class until we hit this section. Right now I'm struggiling with substituton. Here's a promblem I'm working on.
Equation 1: 4x-7y+=10
Equation 2: y= x-7
I need to find the coordnits, bt honestly I have no clue how!!! Please help if you can.

Click here to see answer by josgarithmetic(39617)

Question 713460: y=2x
x+2y=8
Click here to see answer by jim_thompson5910(35256)

Question 713659: I have forgotten how to complete problems like y=4x to graph and show work
and y = 4x-2

thank you for your help i am so glad there are people like you who offer help without charging there is not too many decent people in the world anymore and it is nice to know that there are some that will help without $ being a motive but simply because they enjoy helping!
Click here to see answer by josmiceli(19441)

Question 713781: Y=p+q+r/4. The solution is q=?
Click here to see answer by solver91311(24713)

Question 713851: 9(x+3)=4x-3
Click here to see answer by BGutridge(15)

Question 714193: Using linear combinations, how would you solve:
m+3n=2
-m+2n=3
Click here to see answer by jim_thompson5910(35256)

Question 714302: How to work the equation 5m+4-m=20 ?
Click here to see answer by solver91311(24713)

Question 714303: n-5 greater than or equal to 3
Click here to see answer by solver91311(24713)

Question 714319: please help solve
-2x+y= 8
3x+y= -2

Click here to see answer by solver91311(24713)

Question 714323: please help solve
3x-4y=8
2x+y=9
Click here to see answer by Alan3354(69443)

Question 714327: please help solve
6x-5y=3
x-9y=25
Click here to see answer by Alan3354(69443)

Question 714573: Please, I need help answering this question. I have been at it for 15 minutes..
(2,8); 3x + y = 5
Click here to see answer by solver91311(24713)

Question 714573: Please, I need help answering this question. I have been at it for 15 minutes..
(2,8); 3x + y = 5
Click here to see answer by Alan3354(69443)

Question 714613: Hi!
How to solve:
x^2+y^2=25
x+y=1
Thank you!
Click here to see answer by Alan3354(69443)

Question 714627:
Determine the value of k so that the line passing through the points (k,5) and (4,-1) is perpendicular to the line containing points (2,-2) and (1,-5).
Express your result as an exact number, using a fraction if necessary.
Click here to see answer by mananth(16946)

Question 714887: What is the equation of line as a solution for the given pair (2,10) and (1,5)
Click here to see answer by jim_thompson5910(35256)

Question 714935: y = x� + 3x � 4
y = 2x + 2

Click here to see answer by lynnlo(4176)

Question 715019: Hi, how do you solve x/4-y/4=-1 and x+4y=-9 by substitution?
Click here to see answer by JBarnum(2146)

Question 715042: x/a+x/b=c multiply both sides by ab/1 xb +xa =cab divide both sides by b+a i have x+x =cab/b+a but answer in book says x= cab/a+b what am i missing
Click here to see answer by KMST(5328)

Question 715238: Hi, how do you solve x+2/2 - y+4/3=3 and x+y/5=x - y/2 - 5/2
Click here to see answer by mananth(16946)

Question 715324: I need help with this please. Graph the parabola whose equation is given and answer the questions.
y=-x^2-4x-3
I am stuck on finding the x intercepts and y intercepts for this. I have gotten that this opens downward and the vertex is (-2,1).
Thanks!
Click here to see answer by stanbon(75887)

Question 715463: Heres my question 10x-4-5x=6+3x-8 Thank you so much :)
Click here to see answer by Alan3354(69443)

Question 716044: factor:
3n^2 +7n+4
Click here to see answer by lenny460(1073)

Question 716246: solve the system of equation using substitution method.enter as ordered pair.
x+7=3
y=8
Click here to see answer by checkley79(3341)

Question 716212:
A metal pipe 90 cm long is cut into two pieces so that the longer piece is 15 cm longer than twice the length of the shorter piece. What is the length of the longer piece?
Click here to see answer by checkley79(3341)

Question 716302: please help me to understand substitution. here is an example 2x+5y=5
x+3y=4
Click here to see answer by solver91311(24713)

Question 716302: please help me to understand substitution. here is an example 2x+5y=5
x+3y=4
Click here to see answer by lynnlo(4176)

Question 716277: I need a brief explanation on how to solve system of linear equations using addition/elimination, I understand the other 2 but do not get this one please help!
3x+2y=-13
5x-1y=-13
Click here to see answer by ankor@dixie-net.com(22740)

Question 716459: how do you slove ts question usingthe sub method
6x+14y=54
3x+5y=30
Click here to see answer by stanbon(75887)

Question 716459: how do you slove ts question usingthe sub method
6x+14y=54
3x+5y=30
Click here to see answer by josmiceli(19441)

Question 716477: write each equation in slope-intercept form:
x/3+y/4=1
2x-3y=12
Click here to see answer by stanbon(75887)

Question 716796: Find the slope of a line perpendicular to y=2x-1
Click here to see answer by checkley79(3341)

Question 716792: 9x-2y=15
4x+3y=-5
Solve by elimination
Click here to see answer by checkley79(3341)

Question 717033: What is the solution to the system of equations y = 2x and y = -x + 3?
Click here to see answer by jsmallt9(3758)

Question 717043: -5+x/x-1=8
I just need some help working out how to do this please
Click here to see answer by ankor@dixie-net.com(22740)

Question 717124: Solve the following system of linear equation addition method
8x+3y=-5
3x+3y=10
Click here to see answer by 20800563(2)

Question 717324: Solve the System of Equations
2y=3x+8
y=2x+3
Click here to see answer by jsmallt9(3758)

Question 717335: write and solve a system of equations to find the cost of a large popcorn and the cost of a small drink.
3 large popcorns buckets 2 small drinks total $21.00
2 large popcorns buckets 4 small drinks total $22.00
Click here to see answer by jsmallt9(3758)

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