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

Tutors Answer Your Questions about Linear-systems (FREE)

Question 179084: Use linear combinations to solve the linear system. Then check your solution.
x+y=4
x-y=-10
Click here to see answer by HyperBrain(694)

Question 179126: What value of "b" will make the system y = 3x +4 and y = 1.5x + b intersect at the point (5,19) ?
Click here to see answer by MissionPossible(18)

Question 179219: if I am graphing a linear equation and the answer is
-x=9 does that mean that the answer changes to x=9 since x can not be negative or do I have this mixed up with something else.
I have to graph the linear equation which is -x=-8y+9
When I do it I did it this way
-x=-8y+9
-x=-8*1+9
-x=-8+9
-x=1 is the answer, but does this change if there is a rule that you can not have a negative x?????
Click here to see answer by solver91311(24713)

Question 179246: i dont know how to do it
Click here to see answer by Alan3354(69443)

Question 179477: Computer Warehouse sells batteries ($3) and small boxes of pens ($5). In July, total sales were $960.
Customers bought 5 times as many batteries as boxes of pens. How many of each did Computer Warehouse sell?

Click here to see answer by stanbon(75887)

Question 179489: please help me solve this graphing problem
Solve the following system:
y = 2x - 5
y + 1 = 2(x - 2)

Click here to see answer by jim_thompson5910(35256)

Question 179497: 4x + 5y =40
6x + 7y =58

the same variable will satifty the solution
Click here to see answer by jim_thompson5910(35256)

Question 179505: I have this discussion question to answer and I am really confused by it. Your help would be appreciated.
Determine whether this statement "makes sense" or "does not make sense" and explain your reasoning. Because the percentage of the U.S. population that was foreign-born decreased from 1910 through 1970 and then increased after that, an equation of the form y = ax^2 + bx + c, rather than a linear equation of the form y = mx + b, should be used to model the data
Click here to see answer by eperette(173)

Question 179543: 3x+y=6
6x+2y=10
Use substitution method to solve this system
Click here to see answer by jojo14344(1513)

Question 179553: vx
Click here to see answer by nerdybill(7384)

Question 179593: Solve the system of equations using the addition (elimination) method.
If the answer is a unique solution, present it as an ordered pair: (x, y). If not, specify whether the answer is "no solution" or "infinitely many solutions" and state how you arrived at that conclusion.
4x + 10y = 2
3x + 5y = 5

Click here to see answer by stanbon(75887)

Question 179608: y = 3x - 10
y= 2x - 5
i need to use this using the substitution method
Click here to see answer by Mathtut(3670)

Question 179767: i do not understand how to solve this problem y=x-9 x+8y=0
Click here to see answer by Mathtut(3670)

Question 179629: How do you solve this equations: For Y

1) x-6= -1/3y
2) x-7/2=0
3) 4x-3/8y=1
4) 4x/3=3y/4+1
5) 3x/4+y/2=6
Click here to see answer by checkley77(12844)

Question 179519: solve by graphing and find the two coordinate pair as a solution of the two equations below:
X-Y=-4
2y+X=5
P.S.- the coordinate pair as the solution must be the same for both equations
Click here to see answer by Fombitz(32388)

Question 179852: How do I solve. 3x=22-y
Click here to see answer by Alan3354(69443)

Question 179861: Find two numbers whose sum is 56 and such that one is 3 times as large as the other.
Click here to see answer by HyperBrain(694)

Question 179858: Ace Rent a cAR CHARGES A FLAT FEE OF $15 AND 0.24 A MILE FOR THEIR CARS. aCME rENTR A CAR CHARGES a flat fee of 29 and 0.14 for their cars. Use the following model to find out how many miles Ace Rent a car becomes more expensive.
c=15+0.24m
c=29+0.14m
Click here to see answer by Mathtut(3670)

Question 179943: 5x+4y=22

3x + 4y=10
Click here to see answer by Mathtut(3670)

Question 180071: When solving a linear equation in one variable, the objective is to isolate the variable on one side of the equation. What does that mean and give an example.
Click here to see answer by Mathtut(3670)

Question 180144: it a worksheet...
y=5x+5
y=15x-1

5x+5=15x-1
Click here to see answer by solver91311(24713)

Question 180219: I am so lost on this lesson. Help please! :)
5r - 4s - 3t = 3
r = 3s + 1
t = s + r
Click here to see answer by Fombitz(32388)

Question 180219: I am so lost on this lesson. Help please! :)
5r - 4s - 3t = 3
r = 3s + 1
t = s + r
Click here to see answer by stanbon(75887)

Question 180245: Solve the linear system by using substitution.
6x-y=-35
5x-2y=-35
Click here to see answer by jim_thompson5910(35256)

Question 180216: Find all x for which x^3-x^2-x+1 /x^3-x^2+x-1 = 0. Please can someone help me? I'm not even sure if this problem belongs in this section, let alone, how to do it. Thanks!!!
Click here to see answer by stanbon(75887)

Question 180450: The system y=3x+5
3y-9x+1=0 is?
dependent
consistent
inconsistent
equivalent
Click here to see answer by Mathtut(3670)

Question 180671: 2m + n = 1
m - n = 8
Click here to see answer by josmiceli(19441)

Question 180678: Could you please help me solve this, I have been trying for two days and I am not understanding what I am doing wrong. Thank you soooo much!!!!
THe directions state to solve each by substitution and determine whether the equation is independent, dependent, or inconsistent.
2y=x+6 (this is the first part)
-3x+2y=-2 (this is the second part)

Click here to see answer by Earlsdon(6294)

Question 180757: The (x,y) is the solution set to the system 2x-y=-4
5x+9y=13, then
a. -3 b. 0 c. -3 d. 0
Click here to see answer by Mathtut(3670)

Question 180906: Solving Linear Systems graphically
d) 3x+2y=6 g) 2x-5y=10
y=4-x x+3y=-6

Thankssssssss and ppleaseeeeeeeeeeeeeee
Click here to see answer by jim_thompson5910(35256)

Question 178803: What are the conditions when the solution of a system of inequalities will be in the first quadrant?
Am I understanding this question correctly? I believe neither variable can be negative in order to be in the first quadrant.

Click here to see answer by carter6949(26)

Question 181066: The system 3/4x - 1/5y + 3=0, 5x+y-1=0 is equivalent to.
a. 15x-4y+60=0
-15x+3y-3=0
b. 15x-4y+60=0
15x+3y-3=0
c. 15x-y+15=0
-15x-3y-3=0
d. 15x-4y+60=20
15x+3y-3=3
Please help
Click here to see answer by solver91311(24713)

Question 181117: How would you solve this linear system by graphing x+5y=-10(Equation 1)
x+5y=5 (Equation 2)

Click here to see answer by solver91311(24713)

Question 181117: How would you solve this linear system by graphing x+5y=-10(Equation 1)
x+5y=5 (Equation 2)

Click here to see answer by stanbon(75887)

Question 181126: I was wondering if someone might be able to show me how to use the substitution process to solve the folling linear equation. I can do it but the one like this confuses me. Please show me step by step how this one is done.
x+y=3
x=2y-------this is what is confusing me since x is already solved for.
Thanks for any help anyone is able to give!!
Click here to see answer by Alan3354(69443)

Question 181160: can you help me please
Click here to see answer by Alan3354(69443)

Question 181160: can you help me please
Click here to see answer by solver91311(24713)

Question 181163: How do you work
{y=2x
{y=-6x+4
Click here to see answer by Alan3354(69443)

Question 181163: How do you work
{y=2x
{y=-6x+4
Click here to see answer by stanbon(75887)

Question 181163: How do you work
{y=2x
{y=-6x+4
Click here to see answer by eperette(173)

Question 181174: Powdered Milk worth $3.60/kg and cocoa worth 5.20/kg are to be mixed so that their combination is worth 82.40. How many kilograms of milk should be used if the weight of the milk is 10 more that of the cocoa?
Click here to see answer by Mathtut(3670)

Question 181260: Hello, I finished school what seems like years ago. I have signed up to try and woth for the airforce as an officer. My maths is really rusty. There is a problem in one of their test papers which i dont understand. Its probably very simple.
3to the power of x = 81
I cant put the x above the 3 not sure how to enter that into a computer. Do you have any recommendations about reviving previous knowledge i have with maths?
thanks
Jesse
Click here to see answer by ptaylor(2198)

Question 181302: Are all linear equations functions?I would say no but In what instance is a linear equation not a function?I need an equation of nonlinear function and I don't knwo how to write that or where to start. Thank you!
Click here to see answer by eperette(173)

Question 181314: What are the similarities and differences between functions and linear equations?
Click here to see answer by Mathtut(3670)

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