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

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 Linear Solvers Practice Answers archive Word Problems Lessons In depth

 Question 54435: Please help. I don't understand this. Solve the following system by substitution. If a unique solution does not exist, state whether the system is inconsistent or dependent. 4x – 12y = 5 and -x + 3y = -1 Click here to see answer by funmath(2925)

 Question 54434: I need your help please. Solve the following system by substitution. If a unique solution does not exist, state whether the system is inconsistent or dependent. 8x – 4y = 16 and y = 2x - 4 Click here to see answer by tiffanyc(9)

 Question 54433: I need your help with this please. Solve the following system by substitution. If a unique solution does not exist, state whether the system is inconsistent or dependent. 5x – 2y = -5 and y – 5x = 3 Click here to see answer by stanbon(57290)

 Question 54432: I do not understand how to solve this, please help. Solve the following system by addition. If a unique solution does not exist, state whether the system is inconsistent or dependent. x + 5y = 10 and -2x – 10y = -20 Click here to see answer by funmath(2925)

 Question 54436: I need help. Solve the following system by using either addition or substitution. If a unique solution does not exist, state whether the system is dependent or inconsistent. 10x + 2y = 7 and y = -5x + 3 Click here to see answer by venugopalramana(3286)

 Question 54593: can you please help i forgot how to do this Solve each equation by the subtraction method. Determine whether the equation are independent, dependant, or inconsistent. 28. x =y + 4 3y – 2y = 4 thank you in advance Click here to see answer by funmath(2925)

 Question 54681: A principal of \$2500 is invested; part at 8% per annum and the rest at 12% per annum. In one year, the two investments earned equal amounts of interest. How much was invested at each rate? Click here to see answer by checkley71(8403)

 Question 54707: A crate of grapefruit has a total mass of 4 kg. When 12 grapfruit are removed, the total mass is 3kg. Determine the mass of the crate and of the grapefruit. I have an answer but i'm just making sure. Thx Click here to see answer by Nate(3500)

 Question 54827: Paul works for \$6 an hour on weekdays, and makes \$7 on weekends. Last week he made \$250 for 40 hours. Determine how many hours he worked during the week and how many during the weekend. Click here to see answer by checkley71(8403)

 Question 55055: Hi, the question i have is that a computer is purchased at end of 1999 for \$3000. Scrap value of the computer in 2001 is expected to be \$500. Find a linear function that describes the value of the computer, if t is the age of the computer in years. I wouldn't know where to start!! thanks. Click here to see answer by Hook(36)

 Question 55067: Solve the system by graphing, addition and substitution methods. x + y = 3, x + y = –1 Click here to see answer by funmath(2925)

 Question 52598: Here is the problem: Find the solution to the following systems of equations: 3x-2y+4z=8 x-y-2z=5 4x-3y+2z=13 Click here to see answer by rchill(405)

 Question 52021: Hi, i have the following question that I have to dertime the linear function f(t) with slope= -1 and f(2)=1. thanks for the help Click here to see answer by rchill(405)

 Question 51456: What form does the solution(s) of an independent system of two linear equations in two variables take and where do you find the solution(s) on a graph? Click here to see answer by rchill(405)

 Question 51328: Solve each of the following systems by addition. If a unique solution does not exist, state whether the system is inconsistant or dependent. 2x + 3y = 1 5x + 3y = 1= and this one too please! x + 5y = 10 -2x - 10y = -20 Thank you so much for your help. littletornado52 Click here to see answer by rchill(405)

 Question 50289: How do I solve the following system by graphing?? Please help 3x-6y=9 x-2y=3 Tried using the plotter online and it does not have a way to input this kind of problem. Or at least I do not know what I am doing to figure it out. Click here to see answer by rchill(405)

 Question 50177: Need help solving the following system by graphing. 3x-6y=9 x-2y=3 Click here to see answer by rchill(405)

 Question 49042: I have a graph plotted (7,5) and (8,3) , horizontal axis is D and vertical axis is P. i need to get the equation of the line joining these points, i.e) P= 1d - 2 but it isnt that and i cant work it out, any help would be appreciated. Click here to see answer by rchill(405)

 Question 55056: Hi, the question I have is a manufacturer of tv dinners has monthly revenue of R= -q^2+25q R is revenue in hundreds of dollars when q dinners are produced. Cost function is C=4q+40 where C is also in hundreds of dollars. Manufacturer is limited to producing 2500 dinners per month. Solve the equations and use a graph to show how manufacturer can operate a profit. To solve the equations would I have 2500= (-q^2+25q) - (4q+40) since profit is cost-revenue. So then I have 2500= -q^2 + 25q -4q -40 2500 = -q^2 + 21q -40 2500+40 = -q^2 +21q 2540 = -q^2 +21q equation to make profit would be -q^2 + 21q - 2540 Then do i find points from this equation to graph it?? I really have no idea and am working with a guess. Tahnks for any help you could possibly give me!! Click here to see answer by stanbon(57290)

 Question 55054: Hi, I have the following question and I don't know what to do. It is the demand for goods is p^2 + q^2 = 169 where p is price and q is quantity. The supply equation is p = q + 7. What are the equilibrium price and quantity? I'm unsure but i'm assuming that equilibrium is where supply equals demand but the demand equation has roots, so would it be p+q= square root of 169 then that equals p-q-7. But i still from that cannot get a price for p and a price for q. I'm extremely stuck and any help would be greatly appreciated. Click here to see answer by Hook(36)

 Question 55257: write the slope-y-intercept equation form of the line which has slope 2/3 and passes through the point: (-3,3) write the point-slope equation form of the line which passes through 2 points: (-9,0), (-5,3) write the general equation form of the line which passes through the 2 points:(1,2), (6,7) Click here to see answer by venugopalramana(3286)

 Question 55432: I cannot figure this one out and I have been trying for a while now. I need help please. Please show me the steps to solve this. D Steele Solve the system by substitution: 3X + 5Y = 2 Y = -X + 2 Click here to see answer by Edwin McCravy(8906)

 Question 55615: find the point of intersection for the lines below using the substitution 3x+2y=4 y=1-2x Click here to see answer by Cintchr(481)

 Question 55614: find the point of intersection for the lines below using the substitution 3x-4y=6 x=3y+2 Click here to see answer by stanbon(57290)

 Question 42919: More important than telling me what the solution is, is telling me how, in simple (non-textbook, complicated words) terms how to solve problems such as these. I read and re-read the chapters that explain this problem but it is way over my head and I am getting physically ill from the stress. Please help?!?!? Thank you so much, G. I. Archer Click here to see answer by stanbon(57290)