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

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Question 151144: Is it safe to assume that linear equations do not have a domain? Why or why not?

Click here to see answer by mducky2(62)

Question 151163: Could you please help me solve this system of equations?
5x+3y+z=-13
x-3y+2z=1
14x-2y+3z=-16
Click here to see answer by nabla(475)

Question 151183: calculate:
x - 3x=2

Click here to see answer by vleith(2983)

Question 151256: can anyone help me find the answer.it is about application of linear system.the question is like this,a salesperson is offered two salary plans.the first gives a basic salary RM 1000 a month and a 5% comission on all sales,while the second plan gives basic salary of RM 1500 a month and a 4% comission.so if x is the amount of sales y and y the monthly salary,how much sales are required so that each plan yields the same total salary?
Click here to see answer by joLeeBee(6)

Question 151236: how do you solve with slope intercept form and standard form 5y=4x-2 (5, -1)
Click here to see answer by joLeeBee(6)

Question 151298: Could you please help me solve the system of equations?
3x+3y+z=5
x-3y+2z=-13
8x-2y+3z=-8
Click here to see answer by jim_thompson5910(35256)

Question 151320: Hello may someone please elp me with this question im very confused!
The length of a rectangle is 3 in. more than the width. The perimeter of the rectangle is 24 in.
I THINK THAT I AHVE FOUND THE VARIABLES LENGTH=3iN. WIDTH=24iN.(AM I RIGHT???)

What is the expression for the length in terms of the width?
What is the length of the rectangle?
Click here to see answer by stanbon(75887)

Question 151342: Could you help me solve for the ordered pairs?
y=5^(3x+1)
y=25^(-x)
Click here to see answer by scott8148(6628)

Question 151387: Could you please help me solve this system of equations? When I attempted to solve it I came out with (0,1,-5). This does not seem correct.
5x+3y+z=0
x-3y+2z=9
14x-2y+3z=11
Click here to see answer by oscargut(2103)

Question 151438: Could you please help me solve this equation for A, B, and C.
11x^2-x+8/(x+1)(X^2+4)=A/(x+1)+Bx+C/X^2+4
Click here to see answer by jim_thompson5910(35256)

Question 151581: Could you please help me solve this equation for the ordered pair? I can come up with the first part of the answer, but he second part of the pair I can't get.
y=2^(5x+1)
y=4^(-x)
Click here to see answer by vleith(2983)

Question 151590: Jessie is four years older than Lea. Eight years ago, he was twice as old as Lea. Find their present ages. Solve using two variables.
Click here to see answer by nerdybill(7384)

Question 150728: I need to form the following equations and plot the graph of these equations
linear equation with one variable
Linear equation wit two variables.
Click here to see answer by mangopeeler07(462)

Question 151677: solve for x
(x-5)/3 - 3/3 = (4x + 7)/6
Click here to see answer by jim_thompson5910(35256)

Question 151992: How can you determine if two lines of perpendicular?
Click here to see answer by Earlsdon(6294)

Question 152079: I need help with this one question i have been stuck on for a few days now here it is.
A process of elimination.
6x+2/3y= 9
2x+2/3y= 7
i dont have a text book number because it is in a module book
Click here to see answer by Earlsdon(6294)

Question 152081: Help with this one too?
This linear systems by substitution, i think this is a no solution problem though , i have tried everything and i can not get it . I have literally been on this question for 3 months now.....
i may just have a big brain fart or something but here it is.
3x+5y=12
x+3y=6
Click here to see answer by scott8148(6628)

Question 152170: a grocer needs to mix raisins at $2.00 per lbs with granola @ $3.25 per lbs to obtain 10 lbs of mixture that cost $2.50 per lb. how many pounds of each must be used?
Click here to see answer by nerdybill(7384)

Question 152168: how much cream and milk to the nearest thousandth of a gallon must be mixed together to obtain 50 gallons of cream that contains 12.5% butterfat
facts:
how many gallons of cream containing 25% butterfat and milk containing 3.5% butter fat must be mixed to obtain 50 gall of cream containing 12.5% butterfat?
Click here to see answer by ankor@dixie-net.com(22740)

Question 152172: solve the system:
x+y=4
x+z=4
y+z=4
Click here to see answer by mducky2(62)

Question 152235: HOW WOULD I SOLVE THIS algebracially ?

3/4x-2/5y=2
1/2x-3/5y=-2
Click here to see answer by jim_thompson5910(35256)

Question 152167: System of Linear Equations:
Solve the system using the addition method.
5x=6y+40
2y=8-3x
Click here to see answer by checkley77(12844)

Question 152381: hello. I am having difficulties with my summer math packet, I am really stuck on the problems that have to do with slope, one of these problems is to determine the slope of the line that passes through (5, 1) and (2, 7) so far, I have determined that it may be 6/-3, I used the y2-y1/x2-x1 formula, but I still sense it may be wrong. . I have even more difficulty when I have to use fractions with it such as (-1/2, -2) and (-3/2, 1), I have completely forgotten everything, and desperatly need help
Click here to see answer by Earlsdon(6294)

Question 152483: Your organization is planning a conference with 193 people in attendance that need transportation. There are 8 drivers available and 2 types of vehicles, buses and SUV�s . The bus seats 51 people each. The SUV seats 8 people each. How many buses and SUVs will be needed?
Let b= # of buses
Let s= SUVs
Drivers s+b =8
People 51b + 8b = 193

Click here to see answer by vleith(2983)

Question 152479: Systems of equations can be solved by graphing or by using substitution or elimination. What are the pros and cons of each method?
Click here to see answer by Fombitz(32388)

Question 152476: Solve by elimination: 5x -6y = -32
3x+6y= 48

Click here to see answer by oscargut(2103)

Question 152569: How many solutions are in the equation: (-2x+y=1, -4x+2y=-8)
Click here to see answer by jim_thompson5910(35256)

Question 152717: MY LAST MODULE QUESTION!!! YAYA! but i cant figues it out ....
Help please??
q: A concert promoter set the following ticket prices: $8 for adults, $5 for students. There were 1800 tickets sold for a total of $12 750.
a. Write a system of equations in two variables to model the situation.
b. solve the system of equations.
c.indicate the number of adult tickets and student tickets sold.
d. check that your answer fits the equation.
Click here to see answer by Fombitz(32388)

Question 152782: i need help solving linear equations i dont remember how to exactly. help!!!
2x-2(2-x)=40
2(2x+4)=-3(2x+1)
12-(3x-2)=2(x-1)+3x
-3(x-2)=5(2x-12)
Click here to see answer by oscargut(2103)

Question 152834: Paint Town sold 45 paintbrushes, one kind at $8.50 each and another at $9.75 each. In all, $398.75 was taken in for the brushes. How many of each kind were sold?

Click here to see answer by Fombitz(32388)

Question 153025: Fundraising. The St. Mark�s Community Barbecue served 250 dinners. A child�s plate cost $3.50 and an adult�s plate cost $7.00. A total of $1347.50 was collected. How many of each type of plate was served?

Click here to see answer by jojo14344(1513)

Question 153024: Fundraising. The St. Mark�s Community Barbecue served 250 dinners. A child�s plate cost $3.50 and an adult�s plate cost $7.00. A total of $1347.50 was collected. How many of each type of plate was served?

Click here to see answer by orca(409)

Question 153023: Example to solve:
Mixing Cleaning Solutions
King�s Service Station uses two kinds of cleaning solution containing acid and water. �Attack� is 2% acid and �Blast� is 6% acid. They want to mix the two to get 60qt of a solution that is 5% acid. How many quarts of each should they use?

Click here to see answer by ankor@dixie-net.com(22740)

Question 153084: For a school play, 340 tickets with a total value of $810 were sold. Some tickets cost $2 and some cost $3. How many of each type were sold?
Click here to see answer by jim_thompson5910(35256)

Question 153187: Solve by substitution or elimination method:
1. 3x - 2y = 8
-12x + 88 = 32
2. 7x - 5y = 14
-4x + y = 27
3. -4x + 3y = 5
12x - 9y = -15
Click here to see answer by jim_thompson5910(35256)

Question 153208: how do you solve y= 1/3x - 3 and y= -2x + 4 algebraically?
this is the question;
Solve the above system of equations algebraically, use the elimination or substitution method.
PLEASE HELP!!!!
Click here to see answer by jim_thompson5910(35256)

Question 153240: you have used all of a $50 gift certificate watching movies at the local theater. Afternoon movies are $4 and evening movies are $6. you have watched a total of 10 movies. HOw much have you spent on evening movies?
Click here to see answer by jim_thompson5910(35256)

Question 153352: Can I please get some help solving these
Solve by substitution or elimination method:
-4x + 3y = 5
12x - 9y = -15

Click here to see answer by jim_thompson5910(35256)

Question 153360: Can you please help me solve this sytem of equations?
6x-5y=3
4x+2y=-14
Click here to see answer by jim_thompson5910(35256)

Question 152808: solve the system:
x+3y+5z=20
y-4z=-16
3x-2y+9z=36
Click here to see answer by Electrified_Levi(103)

Question 153426: x-10/4 + 2/5 = - x/3
Click here to see answer by jojo14344(1513)

Question 153486: Find the equation of the line passing through the points ( - 4, 8) and (5, -1).
Also find the equation of the straight line perpendicular to the line you find above and passing through the point ( -3, -8).

Click here to see answer by checkley77(12844)

Question 153663: A hospital staff mixed 70% disinfectant solution with a 30% disinfectant solution. How many liters of each were used to make a 30L of a 45% disinfectant
:
Let x = amt of 70% disinfectant
:
the resulting amt is to be 30L, therefore:
(30-x) = 30% stuff

Click here to see answer by ankor@dixie-net.com(22740)

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