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 355016: one alloy contains 80% gold (in weight) and another alloy contains 55% gold. how many grams of each alloy should be contained to make a 40kg of an alloy that contains 70% gold? Click here to see answer by mananth(12270)

 Question 354992: I am supposed to solve the systems of equation in three variables. 5x+2y=4 3x+4y+2z=6 7x+3y+4z=29 Click here to see answer by Edwin McCravy(8879)

 Question 355693: can you help me solve this? 2/t=t/4t-6. I cannot get the correct answer of (6,2) Click here to see answer by Fombitz(13828)

 Question 356136: perimeter of a rectangle is 204 inches. the length exceeds the width by 62 inches. what is the length and width? Click here to see answer by mananth(12270)

 Question 356133: -7/2x is equal to or greater than -1/4 Click here to see answer by nyc_function(2733)

 Question 356118: i 2005, the shabelle river rose an estimated 5.25 inches every 15 hours.the increase in water level is represented by the functon f(x)=5.25, where x is the numbe of hours. Click here to see answer by Jk22(389)

 Question 356253: Solution of Linear Systems by the Echelon Method. 4x-y+3z=-2 3x+5y-z=15 -2x+y+4z=14 And: x+2y+3z=11 2x-y+z=2 Thank you in advance! Click here to see answer by Alan3354(30925)

 Question 356299: How do i make a system that will have an infinite number of solutions in the y=a+bx form? Click here to see answer by Fombitz(13828)

 Question 356304: Do two linear equalities always have a solution? If not, why not? If yes, under what conditions? Click here to see answer by Fombitz(13828)

 Question 356553: Solve the system algebraically: x-2y=1 y= sq root of (x-1) Click here to see answer by stanbon(57203)

 Question 356539: Solve the system by the method of substitution. 6x-3y-4=0 x+2y-4=0 Click here to see answer by Alan3354(30925)

 Question 356540: Solve the system by the method of substitution. 1/2x + 3/4y = 10 3/4x - y = 4 Click here to see answer by Alan3354(30925)

 Question 356725: graph the line with the given slope that contains the given point. slope=-1/2;(3,1) Click here to see answer by mananth(12270)

 Question 356680: Solve for x, y, and z. Use only linear combination and/or substitution. Do not use matrices. 2x - 12y + 3z = -19 4x + 6y - 2z = 14 6x - 9y - 4z = 13 Click here to see answer by Fombitz(13828)

 Question 356671: 1. Compute the Fourier transform of the following signals. 2. (a). x(n) = u(n) – u(n-6) 3. (b). x(n) = 2nu(-n) 4. (c). X(n) = (1/4)nu(n+4) 5. (d). x(n) = (ansin(won)) u(n), |a|<1 Click here to see answer by Fombitz(13828)

 Question 356669: 1. Let X(k) denote the N-point DFT of the N-point sequence x(n) a) If x(n) = – x(N – 1 – n), find X(0) for N even and N odd. b) If N is even and x(n) = x(N – 1 – n), find X(N/2). Click here to see answer by Fombitz(13828)

 Question 356890: Tickets at a park are \$1.50 for kids and \$4.00 for adults. On c certain day 2200 people entered the park, and the the admission fees collected totaled \$5050. How many children and how many adults were admitted? Click here to see answer by user_dude2008(1861)

 Question 356552: Solve the system algebraically by the substitution method: y= (x+1)^3 y= sq rt of (x-1) Click here to see answer by Fombitz(13828)

 Question 357006: A mobile phone company offers two monthly calling plans, A and B. Under A, every minute costs \$ 0.10. Under B, the first 100 minutes costs \$ 12 and every extra minute costs \$ 0.08. What monthly talking time would make B the better choice? Click here to see answer by mananth(12270)

 Question 357129: The function H described by H(x)=2.75+71.48 can be used to predict the height in cm of a woman whose humerus is x cm long Predict teh height of a woman whose humerus is 30cm long I believe that I am making this harder than it really is but I am so stumped 30(x)=2.75x+71.48 30(x)=74.55 x=2.485 Am I anywhere close Click here to see answer by jim_thompson5910(28476)

 Question 357134: elimination method 4x+5y=2 8x+10y=4 40x+50y=20 40x+-50y=40 80x=40 x=.5 4(.05)+5y=2 2+5y y=4/5 Not quite sure if this is correct Can you help me please Click here to see answer by user_dude2008(1861)

 Question 357159: How do I find the fourth point for a rectanlge? I can use the other three to find out with a graph, but I do not know how to set up an equation. Click here to see answer by jim_thompson5910(28476)
 Question 357159: How do I find the fourth point for a rectanlge? I can use the other three to find out with a graph, but I do not know how to set up an equation. Click here to see answer by stanbon(57203)

 Question 357149: Train A and B are traveling in the same direction on parallel tracks. Train A is traveling at 100 miles per hour and Train B is traveling at 104 miles per hour. Train A passes a station at 11:10 am. If train B passes the same station at 11:40 am at what time will train B catch up to train A _____am or _______pm Can some one please help me. Not sure on how to set up the equation Click here to see answer by checkley77(12569)

 Question 357097: The larger of two numbers is 8 times the smaller. If the larger number exceeds the smaller by 56, find the numbers. Click here to see answer by neatmath(300)

 Question 357301: Hi Guys, really struggling with this question. Given the Cartesian equation of a circle in the form x^2+y^2+8x-8y+16=0 Find by completing the squares, the centre coordinates of the circle and its radius, Hence sketch the graph of the circle taking care to label the x-axis and y-axis and the origin. Click here to see answer by ewatrrr(10682)

 Question 357417: In need of assistance problem solving: 4/5x=16 m/-3=10 4/5x=16 Click here to see answer by edjones(7569)

 Question 357467: whats the slope of the line with these points (2,5)(6,8) Click here to see answer by nerdybill(6948)

 Question 357470: When the digits of a two-digit number are reversed, the new number is 9 more than the original number, and the sum of the digits of the original number is 13. What is the original number? Click here to see answer by ankor@dixie-net.com(15622)

 Question 357712: Airplane Speed: Two planes start from the same airport and fly in opposite directions. The second plane starts 1/2 hour after the first plane, but its speed is 80 kilometers per hour faster. Find the groundspeed of each plane if 2 hours after the first plane departs the planes are 3200 kilometers apart. I am assuming that the distance = rate x time equation will be used, but I am lost. Click here to see answer by scott8148(6628)

 Question 357749: The trip of the Amazon River in canoes and back to the mouth of the Amazon took 12 hours. Going upstream, the canoes traveled at 5km/h, but downstream they traveled 10 km/h faster. how far upstream did they go? Click here to see answer by mananth(12270)

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