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

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Question 282003: Please graph this equation for me.
2x+5y=10
Click here to see answer by brucewill(101)

Question 282237: three numbers have the sum 207. the second number is 9 more than the first, and the third is 3 less than the second number. find the three numbers.
Click here to see answer by rfer(16322)

Question 282267: I need help solving a linear system problem using linear comblinations. The problem is 7x-4y=-3 and 2x+5y=-7. I got (1,1), but when I use them they don't work right. First I multiplied 5(7x-4y)=5(-3), 35y-20y=-15, 43y=43, y-1.
The next part I multiplied 2(2x+5y)=2(-7), 14x-8y=-6, -14x-35y=49, 43y=43, y=1.
I'm not sure where I need to go with all of this. Please help me.
Click here to see answer by nyc_function(2741)

Question 282373: How do I solve the following using the substitution steps?
5x+2y=7
y=x-7
Thank you. TJ
Click here to see answer by richwmiller(17219)

Question 282366: You can rent a mid size car from Company A for $250 per week with unlimited mileage. A similar car can be rented from Company B for $150 per week plus 25 cents for each mile driven. How many miles must you drive in a week in order for the rental fee for Company B to be equal to that for Company A?
A) 330 miles B) 150 miles C) 160miles D) 400 miles E) None of the above.

Click here to see answer by richwmiller(17219)

Question 282515: How do you solve 2y=6x+4?
Click here to see answer by Alan3354(69443)

Question 282515: How do you solve 2y=6x+4?
Click here to see answer by oberobic(2304)

Question 282711: Four gallons of a 45% acid solution is obtained by mixing a 90% solution with a 30% solution. How many gallons of each solution must be used to obtain the desired mixture?
Click here to see answer by richwmiller(17219)

Question 282696: Please help me get started solving this equation:
4/3x + 2y = 6
I know you need to get a common denominator but I am not sure how this works with a fraction like 4/3x involved....
Click here to see answer by richwmiller(17219)

Question 282721: 1)-x+y=3
2x-2y=6

Click here to see answer by richwmiller(17219)

Question 282765: The cost of producing toy trucks is given by c = 450 + 3.75n dollars where n is the number of trucks produced. If the budget allows $3600 in costs, how many trucks can be made?
A) 840 B) 1080 C) 11,812 D) 1023 E) 753

Click here to see answer by vleith(2983)

Question 282000: Graph these equations.
x-3y=9

x+y=6
Click here to see answer by user_dude2008(1862)

Question 281923: Please help with question
slove using the elemination method
x+5y=-6
2x+5y=3
Click here to see answer by jim_thompson5910(35256)

Question 282992: Help me to understand how to set up a problem when you have an equation like
y= 3x-4
Click here to see answer by rfer(16322)

Question 282930: The combined population of Town 1 and Town 2 was 25,000 in 1990. By 1995 the population of Town 1 had increased by 10% while the population of Town 2 had grown by 9%. If the total population of both towns had increased by 2380 people, what was the population of each town in 1990.

Click here to see answer by nyc_function(2741)

Question 283131: 3x-2y=10, 2x+3y=-2 by substitution
Click here to see answer by richwmiller(17219)

Question 283268: I took Algebra 1 last year and will be taking Algebra 2 next year. I really have no knowledge as to what algebra is other than basic things like if you were to say 3X=9; I would know X=3. Only the most basic of Algebra do I understand and since it will be impossible to take an Algebra 2 class without the concepts of Algebra 1, I have decided I must learn them.
The teacher I had last year simply gave children grades based on behavior, and homework completion, etc.
I recall her doing a few Systems of equations on the board and assigning pages in a textbook that I nor any of my friends or classmates understood. I would appreciate it very much if you could solve a few. I don't have any examples; all I know is that there is a number with X +or- Y = a number.
Thank You very much!
Click here to see answer by richwmiller(17219)

Question 283456: hi , thank you for your time. I'm in grade 11 math and my name is Rita.
My question is:
Resolve algalberqy the systeme of equation f(x)=3x+2 and f(x)=2x-3
and also
thank you very much
Click here to see answer by richwmiller(17219)

Question 283595: graphing lines in standard form 4x-y=3
Click here to see answer by oberobic(2304)

Question 283595: graphing lines in standard form 4x-y=3
Click here to see answer by jim_thompson5910(35256)

Question 283676:
The following points fall on a parabola. Write a system of equations that you could use to determine the equation for the parabola(you do not have to solve the system)
This is what is in the box
x -2 0 1
y 39 5 9
Click here to see answer by scott8148(6628)

Question 283681: The manager of a factory has found the output at the factory can be modeled by the function T(n)=-0.2n squared+8n-24, where n is the number of workers at the factory and T is the output. Find the number of workers,n, needed to maximize the output. Then find the maximum output with with that number of workers..
I have no idea how to solve this one.
Click here to see answer by scott8148(6628)

Question 283897: How do I solve:
x-y=3
-6x+6y=17
and:
2x=2-y
3x+y=-1
Click here to see answer by jim_thompson5910(35256)

Question 284110: Solve the system by substitution:
y=3x+2
2y=6x+4
Click here to see answer by richwmiller(17219)

Question 284175: 5x-40=6y
2y=8-3x by the addition method
Click here to see answer by oberobic(2304)

Question 284346: 1.Write one equation of a line that is perpendicular to x = -3
How would I find that out? where do I begin? I don't just want the answer.

Click here to see answer by richwmiller(17219)

Question 284343: y = 3x +7 and x + 2y = -10
a.Are the lines perpendicular? Explain why by comparing the slopes of the lines.
I just want a guide on how to begin to solve, I dont want the answer.
Click here to see answer by richwmiller(17219)

Question 284345: y = 3x + 7 and x + 2y = -10
a.Do the lines intersect? Explain why. If the lines do intersect, find the point of intersection.
I dont want the answer only a guide on how to begin to solve the answer.
Click here to see answer by richwmiller(17219)

Question 284370: How do i do this: Freshy's pizza shop is having trouble attracting new customers, so Freshy's owner wants to have a week long pizza special. Currently Freshy's makes a profit of $1000 per week. The special promotion will selll pizza's for $5 each, it will require paying for an additional employee must be paid $480 for the week, promotional advertising will cost $700, and it cost $3.50 to make each promotional pizza. How many pizzas must freshy's sell in order to make a profit at the end of the promotion?
Click here to see answer by richwmiller(17219)

Question 284424: x+y=7 and 2x+3y=19 can you solve this problem and what should I study to understand this problem.
Click here to see answer by Alan3354(69443)

Question 284424: x+y=7 and 2x+3y=19 can you solve this problem and what should I study to understand this problem.
Click here to see answer by Edwin McCravy(20056)

Question 284478: I need help with this particular problem 1/2x+y=4
x=0
Click here to see answer by nyc_function(2741)

Question 284572: -2(x+3)<-5
Click here to see answer by rfer(16322)

Question 284572: -2(x+3)<-5
Click here to see answer by richwmiller(17219)

Question 284682: How to solve a system with no solution and graph
EQ1
3x - 5y = -9
EQ2
5x - 6y = -8
Click here to see answer by richwmiller(17219)

Question 284734: I have tried to work this problem can you please help me.
2x<3y + 6
Click here to see answer by Theo(13342)

Question 284735: Please help me solve this equation:

Click here to see answer by Theo(13342)

Question 284834: suppose tom owns 2,000 shares of company X and 10,000 shares of company Y. The total value of tom's holdings of these two companies is $372,000.
Suppose tim owns 8,000 shares of company X and 6,000 of company Y. total value holdings is $400,000
write an equation for tom and tim's holdings. use variables X and Y to represent the value of shares of company X and company Y then need to show the value of share of company X and Y
Click here to see answer by Theo(13342)

Question 285000: y=2x-3
y=-2x+1
Click here to see answer by user_dude2008(1862)

Question 285046: I need make two equations for this problem. if there were 4 people out at a restaurant and their meal cost $30 per plate what is the two equations using X and y x is for the people
Click here to see answer by richwmiller(17219)

Question 285177: 5x-3y=23
x+y=3
Click here to see answer by richwmiller(17219)

Question 285287: 7x-8y=9
solve for y

Click here to see answer by alex224(8)

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