# 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 81733: Solve the system by substitution. 4x – 4y = –4 y = 2x + 0 Click here to see answer by rapaljer(4667)

 Question 81744: Solve the system by addition. 2x – 8y = –5 4x + 4y = –5 Click here to see answer by bucky(2189)

 Question 81735: Solve the system by substitution. x + 2y = 11 –2x + 4y = –6 Click here to see answer by bucky(2189)

 Question 81713: Solve the system by substitution. x + 2y = 11 –2x + 4y = –6 Answer: x = y = Click here to see answer by bucky(2189)

 Question 81740: Solve the system by substitution. x + 2y = 11 –2x + 4y = –6 Click here to see answer by bucky(2189)

 Question 81724: Solve the system by addition. 2x – 8y = –5 4x + 4y = –5 Answer: x = y = Click here to see answer by bucky(2189)

 Question 81760: please help. solve the system by substitution. 5x+4y=-2 y=4x+10 20x-4y=-8 y=2+5x Click here to see answer by rapaljer(4667)

 Question 81762: I don't know which category this problem would fall under but could someone help me out with a step by step explanation please. Solve the system by addition -5x+2y=10 x-3y=11 Click here to see answer by rapaljer(4667)

 Question 81885: respected teacher, i have a big problem. we have not learned this yet in the class. the question is: find four values of(x,y)which satisfy each of the following equations. 1)2x +y = 7 2)x - y = 3 3)x = -y 4)x = y 5)x + y = 11 6)y - 5 = x i didnt understand whether we have to take every single equation in consideration or only one at a time. i tried it by taking one in the consideration. and for the first one got the answer: 2x +y = 7 y = 7-2x so if we substitute x=3 then, y = 7-2*3 y = 7-6 y = 1 thus if x = 3,then y = 1 and likewise we can get other co-ordinates by substituting x ps:and if this way is correct for solving this question,dont solve the other sums.just tell me it is correct thanking you in anticipation, your student. Click here to see answer by scott8148(6628)

 Question 82004: solve each of the following systems by graphing. 2x-y=4 2x-y=6 Click here to see answer by jim_thompson5910(28536)

 Question 82049: Find the values for m and b in the following system so that the solution to the system is (-3,4) 5x+7y=b mx+y=22 Please, and thank you. Click here to see answer by bucky(2189)

 Question 82108: solve the system bny substitution x+y=12 y=2x Click here to see answer by funmath(2925)

 Question 82042: Solve the following system by addition. If a unique solution does not exist, state whether the system is inconsistent or dependent: x+5y=10 -2x-10y=-20 Click here to see answer by jim_thompson5910(28536)

 Question 82177: 3x+y=0 x+y=2 I'm not exactly sure on what catergory this falls under, but I don't understand the problem and basically what I'm doing. Click here to see answer by jim_thompson5910(28536)

 Question 82213: My daughter has been struggling tonight with this algebra problem and I couldn't help! Please help! "Six times as many grandstand tickets g as box-seat tickets b were sold for the baseball game. Grandstand tickets cost \$10 and box-seat tickets cost \$25. The total amount of ticket sales for grandstand and box-seat tickets was \$67,320. We need to write a system of equations that describes the above situation and solve for the number of box seats. We believe one equation is 10g + 25b = \$67,320, but don't know where to go from there. Help. Click here to see answer by scott8148(6628)

 Question 82218: My daughter has been struggling with this algebra problem and I couldn't help help her. Please help! "Carlo needs to buy at least eight flowers and has \$15 to spend. Roses cost \$3 per stem and carnations cost \$1 per stem. Make a graph at the right to show all possible combinations of roses and carnations that Carlo could buy." How would that be graphed. Please and thank you! Click here to see answer by Edwin McCravy(8893)

 Question 82250: solve the system by substitution 8x-4y=16 y=2x-4 Click here to see answer by tutorcecilia(2152)

 Question 82289: I have tried to work this system can you please tell me if it is corect. 4x-12y= 5 -x+ 3y=-1 11y=-4 10x + 2y = 7 5x + 3 This is as far as I know to go with this one please help me. Thank You so much Click here to see answer by stanbon(57282)

 Question 82322: How do I solve this problem using elimination by addition method? x+y=35 x-y=13 Click here to see answer by checkley75(3666)

 Question 82376: (Decide whether the ordered pair is a solution of the system of linear equations) Help me ! How to do ? (1;1) (-1;0) 2x+y=3 x-2y=-1 Click here to see answer by askmemath(368)

 Question 82465: 2x-2y=-12 4x-7y=-15 Click here to see answer by checkley75(3666)

 Question 82445: if there are 2 lines with slopes -5 & 2 which one is steeper? Click here to see answer by checkley75(3666)

 Question 82441: solve the system by substitution 5x+3y=-17, y=3x-15 Click here to see answer by checkley75(3666)

 Question 80296: Use substitution to solve each system of equations. If the system does not have exactly one solution, state whether it has no solution or infinitely many solutions. 0.5x-2y=17 2x+y=104 Click here to see answer by vertciel(183)
 Question 80296: Use substitution to solve each system of equations. If the system does not have exactly one solution, state whether it has no solution or infinitely many solutions. 0.5x-2y=17 2x+y=104 Click here to see answer by jim_thompson5910(28536)

 Question 82563: I am trying to help my cousin who is pretty much failing Algebra I learn how to do her math. I am usually an Algebra wizz. I took Algebra in high school and college. I got an A in college. Now for the life of me I can't remember how to do some of the problems. Please help. Thanks a bunch Joedy Brown Click here to see answer by funmath(2925)

 Question 82573: solve the system by graphing 2x+y=4 x+y=-1 Click here to see answer by jim_thompson5910(28536)

 Question 82569: Solve the system by addition: -5x+2y=10 x-3y=11 Click here to see answer by jim_thompson5910(28536)

 Question 82561: Some scientists believe there is a limit to how long humans can live.* One supporting argument is that during the last century, life expectancy from age 65 has increased more slowly than life expectancy from birth, so eventually these two will be equal, at which point, according to these scientists, life expectancy should increase no further. In 1900, life expectancy at birth was 46 yr, and life expectancy at age 65 was 76. In 2000, these figures had risen to 76.9 and 82.9, respectively. In both cases, the increase in life expectancy has been linear. Using these assumptions and the data given, find the maximum life expectancy for humans. Click here to see answer by ankor@dixie-net.com(15645)

 Question 82595: solve the system by addition, x+y=2 x-y=4 5x-3y=13 4x-3y=11 Click here to see answer by jim_thompson5910(28536)

 Question 82594: solve the system by addition, x+y=2 x-y=4 5x-3y=13 4x-3y=11 Click here to see answer by jim_thompson5910(28536)

 Question 82664: Solve the following ststem of linear inequalities by graphing x+2y<3 2x-3y<6 Click here to see answer by stanbon(57282)

 Question 79277: Hello. I'm trying to solve the following system, but I keep running into fractions rather than whole numbers. (1) If I get rid of the fractions on the first equation by multiplying it by 8, then again by 12... and (2) multiply the second equation by 10 to eliminate Y, I get X = 1644/38 or 4.2590. On the other hand, if I try by susbstitution (Y=5x/12 - 252) from the second equation into the first one, I get X = 79.33. (7/2)X + (5/4)Y = 4 (5/6)X - 2Y = 21 What am I doing wrong? Shouldn't I get a whole number for an answer? Please help. Thanks for your generosity. Click here to see answer by stanbon(57282)

 Question 82711: Solve. If there is no solution or if dependent, so state. x - y + z = -11 x + y + z = -5 x + y - z = 1 Click here to see answer by stanbon(57282)
 Question 82711: Solve. If there is no solution or if dependent, so state. x - y + z = -11 x + y + z = -5 x + y - z = 1 Click here to see answer by jim_thompson5910(28536)

 Question 82709: A certain brand of razor blades comes in packages of 6, 12, and 24 blades, costing \$2, \$3, and \$4 per package, respectively. A store sold 12 packages containing a total of 162 razor blades and took in \$35 dollars. How many packages of each type were sold? Click here to see answer by ankor@dixie-net.com(15645)

 Question 82813: solve the system by graphing x+y=3 x+y=-1 Click here to see answer by Edwin McCravy(8893)

 Question 82829: solve the system by graphing x-y=5 x+y=3 Click here to see answer by jim_thompson5910(28536)

 Question 82924: If for two linear equations f(x) = k and g(x) = -f(x), what can be said about the system of equations f(x) and g(x)? A. They are consistent. B. They are dependent. C. They are inconsistent. D. Insufficient information. Click here to see answer by jim_thompson5910(28536)

 Question 82999: Okay I really need someone's help with this one. Substitution confuses me. I need to solve the system by substitution: 3x+3y=9 y=2x-12 Click here to see answer by checkley75(3666)

 Question 83029: when solving this system by addition x+y=2 x-y=4 Will you tell me only the steps needed to solve by addition only or can it be done. Click here to see answer by jim_thompson5910(28536)

 Question 83475: I know I need to use substitution to solve the system, but can you help me here. 4x-4y=-8 y=2+x please solve Click here to see answer by funmath(2925)

 Question 83497: y=2x x+3y=14 Click here to see answer by navytutor(7)

 Question 83553: I am asking someone to please help me with my last 2 problems for my final which has to be in before 12 midnight. I do not understand what to do with either one of these problems. Thanking you in advance. solve the following system of linear inequalities by graphing. 3x+4y<12 x+3y<6 y>0 give the coordinates of the point graphed.\ A)(-3,2) B)(2,-3) C)(3,-2) D) (-2,3) Click here to see answer by stanbon(57282)
 Question 83553: I am asking someone to please help me with my last 2 problems for my final which has to be in before 12 midnight. I do not understand what to do with either one of these problems. Thanking you in advance. solve the following system of linear inequalities by graphing. 3x+4y<12 x+3y<6 y>0 give the coordinates of the point graphed.\ A)(-3,2) B)(2,-3) C)(3,-2) D) (-2,3) Click here to see answer by Edwin McCravy(8893)

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