# 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 111134: Please help me solve for x, y, z. I understand how to solve for two variables but I don't understand how to solve for three. Solve for x, y, and z. X + Y + 2Z =5 X + Y =5 X + 3Y + Z =11 Click here to see answer by dolly(163)

 Question 111177: Sir i need u help at the earliest . 1. Solve by elimination method:- 4x+5y=6 2/3x-5y=7 2.Solve by substitution method:- 5x+6y=7 7/8x+9/10y=3/4 thank u ........ Click here to see answer by solver91311(16897)

 Question 111493: A rectangle has sides of 3x  4 and 7x + 10. Find the expression that represents its perimeter. Click here to see answer by solver91311(16897)

 Question 111503: 1. 3(5x-9)-x=-12+4x 2. 20-6x=-4(2X-1)+2 please show the steps to the answer so that I can get an understanding of how to complete the problem. Thank you. Click here to see answer by stanbon(57361)

 Question 111545: 20-6x= -4(2x-1)+2 and 3(5x-9)-x= -12+4x i've answered the first problem already but i'd like to see if you end up with the same answer but i seem to not be able to answer the second problem. Thank you for your time and i greatly appreciate your help! Click here to see answer by brandonpark2889(31)

 Question 111546: how do I solve this algebra problem? Solve for "t" in the equation: 7st + 13 = 2s Click here to see answer by solver91311(16897)

 Question 111490: Find the length of each side of the rectangle so that it has the given perimeter. 2x-5 p=50 in. Click here to see answer by elima(1433)

 Question 111671: please help me solve this a.calculate the value of the discriminant of x^2+x+3=0 b.by examining the sign of the discriminant in part a, how many x-intercepts would the graph of y=x^2+x+3 have?why? this is under 1 problem. thank you tutor. Click here to see answer by Earlsdon(6287)

 Question 111861: Hi- I have been working on this problem and I think I am doing it right. I am about halfway done if I am doing it correctly. Solve the system by addition: 2x-4y=7 4x+2y=-1 What I did was multiply the second equation by (2) (2)(4x+2y=-1) 8x+4y=-2 2x-4y=7 _____________ 10x/10 = 5/10 and I come up with x= 1/2 Is that correct? If so how do I replace work the problem so that I can solve for y? I am not certain how to multiply to get rid of the fraction at the bottom? what should I do next? Click here to see answer by jim_thompson5910(28595)

 Question 111869: I am working on the following problem and hope I did it right. Adult tickets for a play cost \$15 and child tickets cost \$6. If there were 33 people at a performatnce and the theater collected \$360 from ticket sales, how many children attended the play? Let X= Adult tix Let Y= Child tix 1x+1y=33 15x+6y=360 Then I had to multiply the first equation by 15. (15)(1x+1y) = 33(15) 15x+15y= 495 Then I had to multiply the other equation by -1 (-1)(15x+6y) =360(-1) -15x-6y=-360 Then I had to add both equations together. 15x+15y=495 -15x-6y=-360 the result was 9y=135 I divided both sides by 9 and came up with y=15. Is that correct? I tried to check my work by inputting 1x+1(15)=33 1x+15=33 then subtracted 15 from both sides and came up with x=18. When I tried to check my work 15(15) +6(18)this is supposed to =360 and I don't think that came out right. What did I do wrong? Thank you. Tracy Click here to see answer by checkley71(8403)

 Question 112108: Solve the system of equations y=2x-10 and x-y=7 Click here to see answer by jim_thompson5910(28595)

 Question 112104: Solve the system by substitution. 5x + 3y = 19 y = 2x  8 Click here to see answer by jim_thompson5910(28595)

 Question 112100: Adult tickets for a play cost \$8 and child tickets cost \$6. If there were 25 people at a performance and the theater collected \$188 from ticket sales, how many adults and how many children attended the play? Click here to see answer by jim_thompson5910(28595)

 Question 112307: Solve the system of equation. If the system is consistent, state the coordinates of the point of intersection. If not consistent, state whether it is inconsistent of dependent. x-y=3 2x+3y=11 Click here to see answer by jim_thompson5910(28595)

 Question 112582: Edna Britten's income from two stocks each year totals \$280. Stock A pays dividends at the rate of 5% and stock B at the rate of 6%. If she has invested a total of \$5000, how much is invested in each stock? Click here to see answer by josmiceli(9681)

 Question 112584: A chemist has 1000 g of a solution that is 40% acid. How many grams of water must be added to reduce the acidity to 25%? Click here to see answer by checkley71(8403)

 Question 112586: The length of a rectangle is 5 more than twice the width. The perimeter is 130. What is the area? Click here to see answer by checkley71(8403)

 Question 112619: I really need some help!!!! Please! Solve this system of equation using either addition or substitution method. George has two investments that yield a total of 185.60 in annual interest. The amount onvested at 8% is 320\$ less than twice the amount invested at 6%. How much is invested at each rate. Amount invested at 8% _____________ Amount invested at 6% _____________ Click here to see answer by scott8148(6628)

 Question 112638: in solving systems of linear equations how do you know whether to eliminate the x's or y's? Click here to see answer by bucky(2189)

 Question 112646: Can you explain me how to solve this problem Solve the following system x+3y=11 6x-2y=7 Click here to see answer by bucky(2189)

 Question 80921: Can you please help me with this question I am totally clueless as to how to answer this question the working that is. Given a line containing the points (1,3) , (2,4) , (3,5) determine the slope- intercept form of the equation, give one additional point on this line and graph the function. Thank you in advance. Click here to see answer by mathnard(10)

 Question 112754: A contractor mixes concrete from bags of pre-mix for small jobs. How many bags with 4% cement should he mix with 10 bags of 11.6% cement to produce a mix containing 8% cement? Click here to see answer by checkley71(8403)

 Question 113232: I just need help setting up the equations and I can do the rest. Word problems have never been easy for me! Substitution method or addition method from system of equations George has two investments that yield a total of \$185.60 in annual interest. The amount invested at 8% is \$320 less than twice the amount invested at 6%. How much is invested at each rate? Amount invested at 8%? Amount invested at 6%? Click here to see answer by SHUgrad05(58)

 Question 113372: write the point slope form of the equation of the line that passes through the point and has the given slope, then rewrite the equation in slope-intercept form (-2, 4), m = 3 Thanks for help Click here to see answer by checkley71(8403)

 Question 113371: write the point-slope form of the equation of the line that passes through the two points (4, -2), (-9, 5) Thanks for help Click here to see answer by checkley71(8403)

 Question 113748: how do write this as a fraction? 7.937 thank you Click here to see answer by checkley71(8403)