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

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 Question 55978: I have the equations 3x+ y+2z=6 x+ y+4z=3 2x+3y+2z=2 I'm supposed to solve using elimination. I've tried eliminating every variable but the answer is never right when i check it. Please help. Click here to see answer by funmath(2926)

 Question 56168: the ordered pair (1, -2) is a solution of the following system..true or false? x+y=-3 x-y=1 Click here to see answer by checkley71(8403)

 Question 56167: (1, -4, 3) is the solution to the system, true or false? x+y+z=0 x-y+5z=20 5x+y+z=4 Click here to see answer by Cintchr(481)

 Question 56258: A company that manufactures bikes has a fixed cost of \$100.00. It costs \$100.00 to product each bike. The selling price per bike is \$300.00 1. write the cost function, C 2. write the revenu function, R 3. determine the breat-even point. Describe what this means. Click here to see answer by funmath(2926)
 Question 56258: A company that manufactures bikes has a fixed cost of \$100.00. It costs \$100.00 to product each bike. The selling price per bike is \$300.00 1. write the cost function, C 2. write the revenu function, R 3. determine the breat-even point. Describe what this means. Click here to see answer by Edwin McCravy(13211)

 Question 56265: Dear turors I ask of help from someone concerning this problem Solve the system by graphing 2x+y=4 x+y=3 Click here to see answer by funmath(2926)

 Question 56277: A company that manufactures bikes has a fixed cost of \$100,000. It costs \$100.00 to product each bike. The selling price per bike is \$300.00 1. write the cost function, C 2. write the revenu function, R 3. determine the breat-even point. Describe what this means. you guys were right, i DID type the fixed cost wrong lol, thanks for your help! Click here to see answer by stanbon(69061)

 Question 55619: 2x-y=5 3x+y=5 find the point of intersection for the lines below by graping Click here to see answer by rchill(405)

 Question 52000: Find the exact decimal value for k where the system of equations has no solution. 5x - 4y = 8, 10x + ky = 11 Help please! Thanks! Click here to see answer by rchill(405)

 Question 56377: the ordered pair (5,6) is a solution to the system: x=y=11 x-y=-1 true or false? Click here to see answer by rchill(405)

 Question 48127: We were told to solve these systems by graphing but, on the graph he has a place for six points it is mapped out as: x y1 y2 0 0 0 0 0 0 My first problem is x + 2y = 4 x + 2y = -2 My solutions were x = (0,2) (4,0) y = (-4,1)(0.-4) How do i graph this where do I place the numbers on the graph. Click here to see answer by rchill(405)

 Question 56519: 8.3 # 28 Solve by substitution Mcgraw Hill 6th editon, Thank you for your time!! 4x-12y=5 -x+3y= -1 Click here to see answer by funmath(2926)

 Question 56518: 8.3 # 20 Solve by substitution Mcgraw Hill 6th editon, Thank you for your time!! 8x-4y=16 y=2x -4 Click here to see answer by funmath(2926)

 Question 56573: plese help me out with this. Im totally confused on what to do. Heres the problem- An express train travels 80km per hour from Ironton to Wildwood. A local train, traveling at 48km per hour, takes 2 hours longer for the same trip. How far apart are Ironton and Wildwood? Click here to see answer by tutorcecilia(2152)
 Question 56573: plese help me out with this. Im totally confused on what to do. Heres the problem- An express train travels 80km per hour from Ironton to Wildwood. A local train, traveling at 48km per hour, takes 2 hours longer for the same trip. How far apart are Ironton and Wildwood? Click here to see answer by ankor@dixie-net.com(18980)

 Question 56588: solve the system: 4x+5y = -24 x-5y = 19 Click here to see answer by checkley71(8403)

 Question 56574: Plese help me out on this.I dont know what equation to use. Here is the problem-A cheeta is 300 ft. from its prey.It starts to sprint towards its prey at 90 ft. per second. At the same time, thee prey starts to sprint at 70 ft. per second. When will the cheeta catch its prey? Click here to see answer by ankor@dixie-net.com(18980)

 Question 56645: How do I know which one to subtract by? EX. -7x-3y=42 Would I subtract by -7x or -3y? Click here to see answer by tutorcecilia(2152)

 Question 56807: I am solving by addition method. These two equations have a bracket at the left end emcompassing both of the equations. {2x + 3y =8 {-5x + y = -3 remember the bracket at the left encompassing both equations. I can't draw one to go for both lines. my attempt {2x + 3y =8 15x+10y=40 {-5x +y =-3 50x-10y= 30 ------------------65x = 70 ---------------------x= 1.76 Then i have to plug back in to the equation: 2x + 3y =8 2(1.76)+3y =8 3.52 + 3y =8 3y=4.48 y= 1.49 Is this correct? Help! Click here to see answer by stanbon(69061)

 Question 56838: Grace;s average driving speed is 3 mph faster than Thelma's. In the same length of time it takes Grace to drive 156 miles, Thelma only drives 147 miles. What is Grace's average speed? Click here to see answer by checkley71(8403)

 Question 56836: I really dont get how to do this. Here it is- Jacob has \$3.50 in nickels and dimes. He has twice as many dimes as nickels. How many nickels and how many dimes does he have? Click here to see answer by checkley71(8403)
 Question 56836: I really dont get how to do this. Here it is- Jacob has \$3.50 in nickels and dimes. He has twice as many dimes as nickels. How many nickels and how many dimes does he have? Click here to see answer by mszlmb(115)

 Question 56849: JOhn does a task in 30 minutes, Jennifer does in 45 minutes and Caryn in 1 1/2 hour. How long would it take for the three of them to do it if they do it together? Click here to see answer by ankor@dixie-net.com(18980)

 Question 56880: SOLVE THE SYSTEM BY GRAPHING X+Y=4 -X+Y=2 ANY AND ALL ASSISTANCE WOULD BE SO GRATEFUL..PLEASE Click here to see answer by tutorcecilia(2152)
 Question 56880: SOLVE THE SYSTEM BY GRAPHING X+Y=4 -X+Y=2 ANY AND ALL ASSISTANCE WOULD BE SO GRATEFUL..PLEASE Click here to see answer by funmath(2926)

 Question 56846: Find the coordinates of the vertices of the triangle whose sides are contained in the lines whose equations are 5x - 3y = -7, x + 2y = 9, and 3x - 7y = 1. 5x - 3y = -7 x + 2y = 9 --> x = -2y + 9 3x - 7y = 1 5(-2y + 9) - 3y = -7 -10y + 45 - 3y = -7 -13y + 45 = -7 - 45 on both sides -13y = -52 divide by -13 on both sides y = 4 put 4 back into the equation to find x: 5x - 3(4) = -7 5x - 12 = -7 add 12 to both sides: 5x = 5 x = 1 (1, 4) check answers: 5x - 3y = -7 --> 5(1) - 3(4) = 5 - 12 = -7 (correct) x + 2y = 9 --> 1 + 2(4) = 1 + 8 = 9 (correct) 3x - 7y = 1 --> 3(1) - 7(4) = 3 - 28 = -25 is not equal to 1. (incorrect) Click here to see answer by funmath(2926)