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

Tutors Answer Your Questions about Linear-systems (FREE)

Question 232888: 9x+3y= -39
-9x+y = 71
y= 71+9x
9x+3(71+9x)= -39
9x+213+27x = -39
x= ?
I know that the coefficient of x is 18 but then I forget how to solve for x

Click here to see answer by Alan3354(69443)

Question 232943: solve by the subsitution method 6x-4y= -56
8x+79=y what is the solution set. I came up with (-4,6) am I close
Click here to see answer by Alan3354(69443)

Question 233013: can you help me with this word problem..??
Roast Beef has 25g or protein and 11g of calcium per serving. A serving of mashed potatoes has 2g of protein and 25g of calcium. How many servings of each are needed to supply exactly 29g of protein and 61g of calcium?
Thanks so much!
Click here to see answer by ankor@dixie-net.com(22740)

Question 233231: I am trying to learn the elimination method. Please tell me what I did wrong.
5x+3y=-13
7x-2y=17
10x+6y=-26
21x-6y=51
31x=25
x= 25/31
5x+3y=-13
5(25/31)+3y=-13
125/31+3y=-13
3y=-13-125/31
that is where I get stuck. Can you help?
Click here to see answer by Alan3354(69443)

Question 233453: Multiply:8(-3x+2y-1)
Click here to see answer by rfer(16322)

Question 233553: How do I solve for addition x-2y=-1, -x+5y=4 when I don't have numbers for x.
I tried x-2y=-1 (x=2y+-1) x=-3,
solve for addition x-2y=-1
-x+5y=4
Click here to see answer by Alan3354(69443)

Question 233640: Solve the system of equations using the addition method
-4x+6y=-6
5x-3y=36
I completely understand how to work this problem until the step to solve for y, which should be a fraction but I don't know how to correctly solve it. Any help will be much appreciated!!
Click here to see answer by Alan3354(69443)

Question 233808: Solve equation for x.
1-(2/x)-(15/x^2)=0
Click here to see answer by stanbon(75887)

Question 233808: Solve equation for x.
1-(2/x)-(15/x^2)=0
Click here to see answer by checkley77(12844)

Question 233815: solve this system of equations by elimination
4x+y=-13
6x+-3y=-15
Click here to see answer by checkley77(12844)

Question 233813: solve this system of equations by elimination
3x+4y=13
5x-9y=6
Click here to see answer by ly12603(44)

Question 233919: please help me find the slope and y-intercept of this equation: y=-2x+5
Click here to see answer by rfer(16322)

Question 233966: This equation has a { on the left side. I do not understand how to solve for x,y and z. I know I have to pair up equations but each attempt proves useless.
5x + 4y - z =1
2x - 2y + z = 1
- x - y + z = 2
Click here to see answer by scott8148(6628)

Question 233933: Please help me find the slope and y-intercept of this equation: y=2/5x-7
Click here to see answer by scott8148(6628)

Question 234069: solve the following system of equations using substitutions 2x-3y=-2 and y=-4x+24
Click here to see answer by mando271(42)

Question 234195: What is the solution set to the following equations: 3x-2y=4,4x+5y=28
Click here to see answer by stanbon(75887)

Question 234579: 11x-3=-1
Click here to see answer by solver91311(24713)

Question 234786: I am not having a good week where the math problems are concerned. Here it is;
Solve for S
1/R=1/S+1/T
I am very lost, help...
Click here to see answer by Alan3354(69443)

Question 234788: solve the equation
system: 7x-47=-10
4y=x-2

Click here to see answer by checkley77(12844)

Question 234782: 5+3y=8 Tell Weather The Function Is Liner If So Graph It?
Click here to see answer by checkley77(12844)

Question 234780: Jerome blends Brand A of coffee that sells for $9.50 a pound with Brand B of coffee that sells for $12.00 a pound. If the 45 pounds of blend sells for $10.50 a pound, how many pounds of each type of coffee did Jerome use?
Click here to see answer by checkley77(12844)

Question 235058: A total of 308 tickets were sold for the school play. The number of student tickets sold was three times the number of adult tickets sold . How many adult tickets were sold?
Click here to see answer by stanbon(75887)

Question 235085: What do x, y, and z equal in the following systems with 3 variables?
x+y+z=-1
2x-y+2z=-5
-x+2y-z=4
Click here to see answer by Alan3354(69443)

Question 235034: 95918548p=98984745676423476187652135496
Click here to see answer by Alan3354(69443)

Question 235338: please SOLVE and CHECK this algebra problem : "the perimeter of a rectangle is 420 inches.The width is 4 inches less than the length.What is the length of the rectangle?"
Click here to see answer by Stitch(470)

Question 235337: please SOLVE and CHECK this algebra problem :"find three consecutive numbers whose sum is 90."
Click here to see answer by rfer(16322)

Question 235282: graph using m and b
6x + 4y = 16
m=
b=
( , )
Click here to see answer by rfer(16322)

Question 235399: What is the solution to the system x=2y=-8 and x-y=13
Click here to see answer by checkley77(12844)

Question 235591: solve for a and b.
0=a^2-b^2
1=2ab
Click here to see answer by solver91311(24713)

Question 235556: I can't figure out how to solve this system of equations with the substitution method. I have tried combining the terms and distributing but I keep getting confused with the process. can you help me?
x=y+6
x+2y=6
Click here to see answer by Alan3354(69443)

Question 235894: Please can you help me solve x=-2y? I will then need to graph it.
Click here to see answer by stanbon(75887)

Question 235894: Please can you help me solve x=-2y? I will then need to graph it.
Click here to see answer by nyc_function(2741)

Question 235799: Write an equation for f(x) if x = (-2,-1,0,1,2) and f(x) = (-2,2,6,10,14).
Click here to see answer by Alan3354(69443)

Question 235918: What is the solution of the system?
I'm trying to remember how to start this one..
x + 7y = 5 (1)
x= 9-7y (2)
Do I reverse the second problem to where it is:
x-7y = 9 (2) ?
Thank You for your help!
Click here to see answer by jim_thompson5910(35256)

Question 235804: Are the following linear or non linear functions?
a. The time it takes you to get to work as a function the speed at which you drive
b. The probability of getting into a car accident as a function of the speed at which you drive
c. A person's height as a function of the person's age (from age 0 to 100)
I believe "A" is linear because the faster you go, the sooner your get to work and vice versa.
I believe "B is non linear beause there are many unknown elements which can determine if a person gets into an acccident besides the speed in which they travel.
I believe "C" is non linear because at a certain point we stop growing. Additionally, as we get older we may even actually get shorter.

Click here to see answer by Alan3354(69443)

Question 235355: The sum of the digits of a 2-digit number is 8. When 36 is added to the number, the digits are reversed. What would be the number?
Click here to see answer by ankor@dixie-net.com(22740)

Question 236065: Using substituion what it the solution for the equations 2x+2y=50;y=x+9?
Click here to see answer by jim_thompson5910(35256)

Question 235933: Solve each of the following systems:
2x+3y=12 (1)
4x-3y=6 (2)
(1) * 2
4x+6y=24 (3)
(3)-(2)
-9y = -18
Therefore y = 2 x = 3
Use the same principles to solve the other linear equations
y=3x+1
2x-3y=4
3x-2y=7
x=4y-11
Click here to see answer by JimboP1977(311)

Question 236171: Given the system of equations 2x + 3y = 1 and 14x + 21y = 7, which one of the following statements is true?
The system has no solutions.
The system has one and only one solution (-1,1).
The system has infinitely many solutions.
The system has one and only one solution (7,7)

Click here to see answer by Alan3354(69443)

Question 236209: The length of the rectangle is 1 meter less than twice its width. What are the dimensions of the rectangle?
Click here to see answer by rfer(16322)

Question 236176: Write a system of two equations in two unknowns for each
problem. Solve each system by the method of your choice.
One-half of the boys and one-third of the
girls of Freemont High attended the homecoming game,
whereas one-third of the boys and one-half of the
girls attended the homecoming dance. If there were
570 students at the game and 580 at the dance, then how
many students are there at Freemont High?

Click here to see answer by checkley77(12844)

Question 236213: The length of the rectangle is one meter less than twice its width. What are the dimensions of the rectangle?
The perimeter is 40 meters
Click here to see answer by rfer(16322)

Question 236247: Monica and Max Gordon each want to buy a scooter. Monica has already saved twenty-five dollars and plans to save five dollars per week until she can buy the scooter. Max has sixteen dollars and plans to save eight dollars per week.
1. In how many weeks will Monica and Max have saved the same amount of money?
2. How much will each person have saved at that time?
Click here to see answer by rfer(16322)

Question 236336: I was asked to simplify this 4z to the eighth power z to the -6 power y to the -9 power times 5y to the -1 power w to the -7 power times 2w to the 7th power
i have not had math for over 30 years stuck bad. Do you also know of any websites that gives free help and explanation of problems and rules.
Any help greatly appreciated
Click here to see answer by Theo(13342)

Question 236084: Suppose Bob owns 2,000 shares of Company X and 10,000 shares of Company Y. The total value of Bob's holdings of these two companies is $340,000.
Suppose Frank owns 8,000 shares of Company X and 6,000 shares of Company Y. The total value of Franks holdings of these two companies is $340,000.
a. Write equations for Bob and Frank's holdings. Use the variables X and Y to represent the values of shares of Company X and Company Y.
b. Solve for the value of a share of Company X and Company Y. Show your work so you can get partial credit even if your final answer is wrong.

Click here to see answer by Theo(13342)

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