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

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Question 475257: 3x+2y=5
x=y-5
solves the linear equations by substitution
Click here to see answer by rfer(12730)

Question 475254: Assume that y varies directly as x. if y=-8 when x=-3, find x when y=6. leave answer in fractional form
Click here to see answer by robertb(4012)

Question 475595:
Please help me solve the system of equation:
-2x-5y-z=57
-5y-2z=54
-5z=35

Click here to see answer by Edwin McCravy(8999)

Question 475635: for the opening day of a carnival, 800 admission tickets were sold. the receipts totaled $3775. tickets for children cost $3 each, tickets for adults cost $8 each, and tickets for senior citizens cost $5 each. there were twice as many childre's tickets sold as adult tickets. How many of each type of ticket were sold?
Click here to see answer by lwsshak3(6761)

Question 475723: What is the equation in point-slope form of the line with x-intercept of 3 and y-intercept of -5.
Click here to see answer by stanbon(57967)

Question 475723: What is the equation in point-slope form of the line with x-intercept of 3 and y-intercept of -5.
Click here to see answer by mananth(12270)

Question 475726: what is the equation in point-slope form of the line perpendicular to 3x+6y=5 and through the point (1,3).

Click here to see answer by stanbon(57967)

Question 475804: the sum of two numbers is 41, the larger number is 1 less than twice the smaller number: translate the word problem into a system of two linear equations.
After you have the two equations then show work to solve.
This is a discussion post question. THank you for your help!
Click here to see answer by ankor@dixie-net.com(15746)

Question 475986: Help me solve the equation elimination method
5u-v=0
3u+3v=-18
Click here to see answer by Tatiana_Stebko(1326)

Question 476155: how to graph
x<6
Click here to see answer by rfer(12730)

Question 476360: DOES THE EQUATION 3Y=2X REPRESENT DIRECT VARIATION
Click here to see answer by stanbon(57967)

Question 476367: THE WEIGHT OF AN OBJECT ON THE MOON VARIES DIRECTLY AS ITS WEIGHT ON EARTH. WITH ALL OF HIS GEAR ON, NEIL ARMSTRONG WEIGHED 360 POUNDS ON EARTH. WHEN HE BECAME THE FIRST PERSON TO STEP ON THE MOON ON JULY 20, 1969, HE WEIGHED 60 POUNDS. TARA WEIGHS 108 POUNDS ON EARTH. WHAT WOULD SHE WEIGH ON THE MOON.
Click here to see answer by stanbon(57967)

Question 476363: WHAT IS THE CONSTANT OF VARIATION FOR THE DIRECT VARIATION EQUATION Y=2/3X
Click here to see answer by stanbon(57967)

Question 476374: IN 1990, PEOPLE IN THE UNITED STATES SPENT ABOUT 285.7 BILLION ON RECREATION. IN 1995, THEY PWNT 402.5 BILLION. FIND THE SLOPE OF THE LINE THROUGH THE TWO POINTS DEFINED DEFINED BY THE RECREATIONAL DATA. WHAT DOES THE SLOPE TELL YOU.
Click here to see answer by stanbon(57967)

Question 476489: Solve the system: 2x+3y=5 3x-2y=-4
Click here to see answer by MathLover1(6812)

Question 476503: 2x+3y=8
3x+2y=7
I have to determind how many solutions exit.
Use either elimination or substitution to find solutions.
I have tried and my teacher told me I had every question wrong. I am lost please help.
Click here to see answer by mananth(12270)

Question 476510: A university bookstore recently sold a wirebound graph-paper notebook for $2.50, and a college-ruled notebook for $2.30. At the start of spring semester, a combination of 50 of these notebooks were sold for a total of $118.60. How many of each type were sold?

I am no good with word problems. I got the answer of 25 and 27 but could not give the equation and my teacher said it was wrong. I don't know.
Click here to see answer by scott8148(6628)

Question 476530: A shopper buys 3 oranges and 5 lemons for $10.26, while a second shopper buys 4 lemons and 6 oranges for $11.16. What is the price of each fruit?
I got 3x+5y=10.26 and 4x+6y=11.16
I gave the answer of x=2.88 y=.324 but i was wrong.
Click here to see answer by bucky(2189)

Question 476581: The solution of 8+8 is 1000. how can i solve this?
Click here to see answer by Theo(3504)

Question 476586: A number is 4 times the sum of its digits.The units digit is two more than the tens digit.Find the number.
Click here to see answer by ankor@dixie-net.com(15746)

Question 476706: can you help me answer 8-5r over 6=3, -4a-1 over -10a=3/8, and y+4 over y-1=4/3

-thanks
Click here to see answer by stanbon(57967)

Question 476712: An express and local train leave GraysLake at 3P.M. and head for Chicago 50 miles away. The express travels twice as fast as the local and arrives 1 hour ahead of the local. Find the speed of each train.

I want to say it would start out with 2x-50=????
Click here to see answer by Alan3354(31519)

Question 477139: Find the augmented matrix...
given the following system of linear equations
3x-2y+3=5
x+4y-1=9
Click here to see answer by jorel1380(2518)

Question 476398: y=2x-7
y=-5x+14
Click here to see answer by bucky(2189)

Question 477494: Solve the following equation for x. Please show all of your work.
w = 1/4(7x - 10y)
Click here to see answer by MathLover1(6812)

Question 477493: Solve. 14 - 9(4 - 3q) = -5(q + 6). Please show all of your work.
Click here to see answer by MathLover1(6812)

Question 477898: I just need help setting up the problem then I can solve it.
#1 In its business plan, a new restaurant predicts that the average amount each customer will spend per visit is $45. The average cost of ingredients per customer will be $22. The overhead cost to run the restaurant will be $12,000 per week. Find the number of customers that must be served each week to break even.

Click here to see answer by nerdybill(7003)

Question 477899: I need help setting up the equations. I almost have it I think, but I want to make sure.
Solution A is 20% acid. Find the amount of Solution A and the amount of pure water needed to make 5 liters of a new solution that is 18% acid.
Thanks!!
Click here to see answer by nerdybill(7003)

Question 477897: how is 10y to the sixth power divided by 10y to the fourth power 10y?
Click here to see answer by Alan3354(31519)

Question 478439: HELP!!!!! Im confused is there a difference between elimination and substitution in systems of equations i understand when to use them but i dont understand the difference thank you for the help!! great review for who ever answers have a beautiful day!
Click here to see answer by Theo(3504)

Question 478629: I am to write an equation of the line containing the given point and parallel to the given line. What is the quation of the line with this given information
(5,7), x+2y=7
Click here to see answer by lwsshak3(6761)

Question 478660: An amount of 40% acid solution is to be mixed with enough 10% acid solution to make 25% acid solution. If there are to be 20 litres of the final mixture, how much of each solution should be mixed together?
Click here to see answer by mananth(12270)

Question 478636: Add two matrices:
[ 3 4
6 5]+
[-1 3
-2 4]
Click here to see answer by Alan3354(31519)

Question 478756: Can someone please help solve the following system of equations
2y=x+6
y=5+4x-x^2
Click here to see answer by mananth(12270)

Question 478842: A car and a plane travel 50 miles and 180 miles during the same time. The difference between their speeds is 143 miles per hour. Find the speed of the airplane.
Click here to see answer by Alan3354(31519)

Question 479135: Solve the Following problems by using the subtitution method.
1.The units digit of a two-digit number is 3 more than its tens digit. If the number is divided by the sum of its digit's, the quotient is 4 and the remainder is 3. Find the number.

2.Paul's investment is 10 000 less than thrice his sister's investment. If their total inestment amounts to 150 000, how much is Paul's investent?

3.Working together, Alleli and gemma can finnish their math project in 5 hours. Alleli can finish it alone twice as much time as gemma can do the job. How long will it take gemme to finnish the project alone?

PLSSS I NEED YOUR HELP, BECAUSE I DONT KNOW HOW TO DO THIS THANK YOU FOR HELPING ME TO SOLVE THIS MY ASSIGNMENT. THANK YOU :)) PLSSS I NEED THE ANSWER NOW AND PLSS INCLUDE THE SOLUTION BY EACH NUMBER THAN YOU
Click here to see answer by mananth(12270)

Question 479217: Solve each system by the addition method.
2x + 4y = 28
x - 2y = 10
Click here to see answer by nerdybill(7003)

Question 479483: 1/6 - x/2 = x/3 - 5/3
Click here to see answer by Maths68(1474)

Question 479610: Please help solve the system of equations
y=50+0.15(x-500) and y=105+0.10(x-650)
Solve the system of linear equations algebraically using either the substitution method or the elimination method to determine where the two cost options are equivalent, showing all work.
a. Explain each step used to solve the system of linear equations. Include the following in your explanation:
• The algebraic method used to solve the system of equations
• All mathematical operations used to solve the system of equations
• The solution of the system of equations

Click here to see answer by mananth(12270)

Question 386679: to solve the system given below using substitution, it is best to start by solving the second equation for x. 5x+2y=33 6y+x=3 true or false?
Click here to see answer by trexman(1)

Question 479811: hello, i would like some help with this equation using elimination 6x-4y=-8
11x+4y=76
What does x= and what does y=?
Thank you for your help
Click here to see answer by emargo19(101)

Question 479829: i really need help on solving linear equations with elimination in non- standard form the equation is 2y=4x-16
5y=4x+8
Thanks for your help
Click here to see answer by Alan3354(31519)

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