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 103651: this multiple choice is hard someone please help x^2+8=57 a. +-quare root 65 b. +-square root 57-8 c. +- 7 d. +- square root 57+8 Click here to see answer by TP(29)

 Question 106834: solve each systems by substitution: 4x-12y=5 -x+ 3y=-1 Click here to see answer by HyperBrain(694)

 Question 106833: solve edach systems by substitution: 8x-4y=16 y=2x-4 Click here to see answer by HyperBrain(694)

 Question 106832: solve each systems by substitution: 5x-2y= -5x y-5x= 3 Click here to see answer by HyperBrain(694)

 Question 106811: x+y+z=30000 .02x+.03y+.06z=1110 .02x+150=.03y : solve for x,y, and z. The problem im having with this problem is the "z" variable. It is only on 2 of the 3 equations. Ive been trying to solve by using the method of elimination, but I cant seem to isolate the variables. thank you. Click here to see answer by HyperBrain(694)

 Question 106976: solve each system by elimination. check your answers. -x-y-2z=4 -x+2y+z=1 -x+y-3z=11 Click here to see answer by checkley75(3666)

 Question 106918: x+5y=10 -2x-10y= -20 Click here to see answer by elima(1433)

 Question 106977: solve each system by elimination. check your answers. -x-y-2z=4 -x+2y+z=1 -x+y-3z=11 Click here to see answer by scott8148(6628)

 Question 107070: find the values for m and b in the following system so that the solution to the system is (-3,4) mx+3y=8 -3x+4y=b Click here to see answer by HyperBrain(694)

 Question 106987: My question involves a word problem: A certain car that is being tested by its manufacturer uses it entire fuel supply in about 38 hours when idling. The same car, when driven at 60 miles per hour on a test track, uses about three-and-a- half times as much fuel per hour as it does when idling. If the engine has been idling for 10 hours and the car is then run at 60 miles per hour, how much longer will the car run before it uses up all of its fuel? I think it is 38 - 10 = 28 divided by 3.5 = 8 hours. I just don't know the exact steps to follow to get the correct answer. Could you please help.... Thank you... Click here to see answer by josmiceli(9678)

 Question 107089: Someone please help me solve this problem, I am going to have similar ones on a test. Find three consecutive even intergers such that three times the second minus the third is 12 more than the first. Click here to see answer by Annabelle1(69)

 Question 107088: I can't remember how to do this type of problem, someone please help me I will be so thankful. Find three consecutive intergers whose sum is 93. Brina Click here to see answer by Annabelle1(69)

 Question 106911: solve each of the systme by using either addition or substitution. If a unique solution does not exist, state whethere the system is dependent or inconsistent: 10x+2y=7 y=-5x+3 Click here to see answer by elima(1433)

 Question 106915: solve the following system by addition. if a unique solution does not exist, state whethere the system is consistent or dependent. 2x+3y=1 5x+3y=16 Click here to see answer by elima(1433)

 Question 107136: Can someone please help me with this type of problem?(-3/7xyz)(x^2y^3)(7xyz^2). Ty Click here to see answer by edjones(7569)

 Question 107138: Will someone please help me, the problem states to find the quotient: -45x^3y^5/3xy^2 thank you Click here to see answer by edjones(7569)

 Question 107137: How do I simplify (3a^2b^3)^4. Someone please help me I have a test coming up soon. Thank You, Ty Click here to see answer by edjones(7569)
 Question 107137: How do I simplify (3a^2b^3)^4. Someone please help me I have a test coming up soon. Thank You, Ty Click here to see answer by bucky(2189)

 Question 107142: can someone please help me solve this problem? 3(x-2)-5(2x-1)>0. The greater than sign should have a _ under it. Click here to see answer by stanbon(57347)
 Question 107142: can someone please help me solve this problem? 3(x-2)-5(2x-1)>0. The greater than sign should have a _ under it. Click here to see answer by edjones(7569)

 Question 107139: I have to solxe this problem for x (if there is an inequality express it in interval notation: x-5<2orx-5>2. Please help me. Click here to see answer by edjones(7569)

 Question 107155: Write and equation of the line containing (5,-2) and (8,4) a. 2x-y=12 b.x-2y=9 c.2x+y=20 Click here to see answer by jim_thompson5910(28595)

 Question 107231: Write an equation in standard form for the line that has an undefined slope and passes through (-2,8) Click here to see answer by Earlsdon(6287)
 Question 107231: Write an equation in standard form for the line that has an undefined slope and passes through (-2,8) Click here to see answer by 3356(1)

 Question 107255: solve each of the following problem by addititon. if a unique solution does not exist, state whether the system is inconsistent or dependent. 2x+3y=1 5x+3y=16 Click here to see answer by Annabelle1(69)

 Question 107332: I'm not really clear on how to set up this type of problem. Any insight would be greatly appreciated. x+y=12 y=3x Click here to see answer by ptaylor(2048)
 Question 107332: I'm not really clear on how to set up this type of problem. Any insight would be greatly appreciated. x+y=12 y=3x Click here to see answer by Fombitz(13828)

 Question 107399: V= pie r sqaure h, solve for h c= d/g solve for g Click here to see answer by Annabelle1(69)

 Question 107447: Solve the following by graphing: 2x - y = 4 2x - y = 6 Second problem 2x - 2y = 8 3x - 2y = 1 Third problem 3x - 6y = 9 x - 2y = 3 Click here to see answer by Annabelle1(69)

 Question 107450: Find the values for m and b in the following systems so that the solution to the system is (1,2). mx + 3y =8 -3x + 4y = b Find the values for m and b in the following systems so that the solution to the systme is (-3,4). 5x + 7y = b mx + y = 22 Click here to see answer by stanbon(57347)

 Question 107478: Solve by any appropriate method.(Substitution or Elimination, I prefer Elimination). L1-(-4,4)and(2,-2) L2-(1,1) and (-3,3). I don't even know where to begin and our teacher and not provided any examples for this type of problem. He doesn't use the book much and I have tried to find examples and am unsuccessful. Click here to see answer by stanbon(57347)

 Question 107522: Solve each of the following systems by graphing: x - 2y = 8 3x - 2y = 12 and 3x - 6y = 9 x - 2y = 3 Click here to see answer by checkley71(8403)

 Question 107530: x/3 + y = 3 x/2 - y/4 = 1 Click here to see answer by solver91311(16885)

 Question 107542: Mr. Irwin and Ms. Lippi are math teachers. They have a total of 46 years of teaching. Two years ago Mr. Irwin had taught 2.5 times as many years as Ms. Lippi. How long has each taught? Click here to see answer by stanbon(57347)

 Question 107543: A limited of a book published by a historical society was offered for sale to its members. The cost was one book for \$12 or 2 books for \$20. The society sold 880 books, and the total amount of money taken in was \$9840. How many members ordered 2 books? Click here to see answer by scott8148(6628)

 Question 107697: rewrite the equation 2x-3y= -6 as a function of x Click here to see answer by stanbon(57347)
 Question 107697: rewrite the equation 2x-3y= -6 as a function of x Click here to see answer by solver91311(16885)

 Question 107690: solve the system by addition 5x+7y=12 x-4y= -3 Click here to see answer by jim_thompson5910(28595)

 Question 107751: given g(x)= -3x-3, find g(2a) Click here to see answer by stanbon(57347)

 Question 107749: given f(x)=x^2-3x-7, find f(5) Click here to see answer by scott8148(6628)

 Question 107750: given f(x)= -x^3+2x^2-2x-2, find f(-2) and f(0) Click here to see answer by checkley71(8403)

 Question 107694: solve the system by addition or substitution -15x+3y=6 y=2+5x Click here to see answer by HyperBrain(694)

 Question 107912: solve the linear system: 3x + 3y= 5 y= -x Please help! thank you Click here to see answer by jim_thompson5910(28595)

 Question 108047: (A linear system) Solve using matrix inverse method. (A^-1B=X) A-Bear's Catering service charges its customers according to the number of servings of each item that is supplied at the party. The table shows the number of servings of jambalaya, crawfish pie, file' gumbo, iced tea' and dessert for the last five customers along with the total cost of each party. What amount does A-Bear's charge per serving of each item? Write all equations that would be used to solve this system.Be sure to define all variables. Jambalaya Crawfish pie File' gumbo Iced tea Dessert cost Boudreax 36 28 35 90 68 344.35 Thibodeaux 37 19 56 84 75 369.10 Fontenot 49 55 70 150 125 588.90 Arceneaux 58 34 52 122 132 529.50 Gautreaux 44 65 39 133 120 521.65 Write the matrix A= write the matrix B= write the matrix x= This is a homework question that me and other classmates have been trying to figure out, but can't. We don't even know where to start. Click here to see answer by stanbon(57347)

 Question 108022: Write an equation of a line that is perpendicular to y= -3/4x + 2 and passes through (-4,1) Click here to see answer by checkley71(8403)

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