# 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 277798: A cellular phone company offers a contract for which the cost C in dollars,of t minutes if telephoning is given by C=0.25(t-300)+59.95, where it is assumed that t>300 minutes. What times will keep costs between \$107.70 and \$125.70? Click here to see answer by checkley77(12569)

 Question 277857: {6x+4y=12 {2y=6-3x graph and classify each system. Then find the solution from the graph Click here to see answer by richwmiller(9135)

 Question 277864: the sum of the length of any two sides of a triangle must be greater than the third side. if a triangle has one side that is 7 inches and a second side is 2 inches less then twice the third side. what are the possible lenghts for the second and third sides? Click here to see answer by edjones(7569)

 Question 277922: I am not sure how to work these three problems : For the systems of linear equations in questions 1-3 Determine how many solutions exist Use either elimination or substitution to find the solutions (if any) Graph the two lines, labeling the x-intercepts, y-intercepts, and points of intersection 1.y = 2x + 3 and y = -x - 4 2.2x + 3y = 8 and 3x + 2y = 7 3.2x + 3y = 8 and 3x + 2y = 7 Click here to see answer by nabla(475)

 Question 277788: Snookers Lumber can convert logs into either lumber or plywood. In a given day,the mill turns out three times as many units of plywood as lumber. It makes a profit of \$30 on a Unit of lumber and \$45 on a unit of plywood. How manyof each unit must be produced and sold in order to make a profit of 16665.? Click here to see answer by ankor@dixie-net.com(15624)

 Question 278155: hello how would i solve this linear system using the cramers rule? 4x-7y-7z= -26 3x-7y-9z=-26 -9x-5y-2z= -51 this is what i have done but it seems wrong i get that d = -145 dx = -1939/ -145 dy = 1175/-145 dz = -1428/-145 this answers seem to work only with the first equation. Click here to see answer by jim_thompson5910(28476)

 Question 278183: 4.00x + 6.00y = 2340 x + y = 480 Click here to see answer by stanbon(57222)

 Question 278248: 4x-2y=4 -20x+10y=-20 is there no solution and does the graph only intersect at 1 point so the solution is unique? Click here to see answer by jim_thompson5910(28476)

 Question 278160: How do you solve this three variable equation? d + e - f = 11 f + d + 5 = e 2e - 12 = f Click here to see answer by ankor@dixie-net.com(15624)

 Question 278302: The degree measure of one of two supplementary angles is 6 more than one half that of the other. What are the degree measures of the angles? Click here to see answer by Grinnell(63)

 Question 278341: i am currently doing a section on this in my class called sloving linear equations by graphing and i dont understand how u do it can u help me? Click here to see answer by Theo(3458)

 Question 278409: directions state: graph each linear equation in two variables & find three solutions in your table of values for equation. y=-1/2x Click here to see answer by JBarnum(2044)

 Question 278510: Solve for X and Y, two system equation: Equation1 4X+Y=17 Equation2 2X+3Y=21 Click here to see answer by checkley77(12569)

 Question 278562: Find the point-slope form of the equation of the line satisfying the given conditions and use this to write the slope-intercept form of the equation. x-intercept = 3 and y-intercept = 2 Click here to see answer by nyc_function(2733)

 Question 278588: how many liters of pure hydrochloric acid must be added to 60 liters of a solution that is 10% hydrochloric acid to get a solution that is 15% hydrochloric acid? Click here to see answer by nyc_function(2733)

 Question 278965: Solve using the elimination method. Show your work. If the system has no solution or an infinite number of solutions, state this. 1/5x - 1/4y = 3 2/5x + 1/2y = 2 I tried this problem on my own and was thinking that I would have to multiply the equations for example: 1/5x - 1/4y * 2/5x = 3 * 2/5x Click here to see answer by Edwin McCravy(8880)

 Question 278978: When you solve a system of linear equations, and you get your x or y how do I know which of the two equations to plug my answer into ? Click here to see answer by Edwin McCravy(8880)

 Question 279086: Solve each system. Number One: y = 2x + 8 y = 3x - 1 Number Two: 2x - y = 2 2x - 2y = 4 Number Three: -x + y = 2 2x + y = -1 Click here to see answer by stanbon(57222)

 Question 279132: Please help solve these 3 system equations for X and Y and Z Equation1. X+Y+2Z=5 Equation2. X+Y=5 Equation3. X+3Y+Z=11 Equation1. 2X+2Y+4Z=10 Equation2. 3X+3Y=15 Equation3. 4X+12Y+4Z=44 What is the difference between these systems of equations? Click here to see answer by J2R2R(94)

 Question 279354: jack and betty have 28 coins that are nickels and dimes if the value of the coins is \$1.95 how many coins of each type do they have Click here to see answer by josmiceli(9650)
 Question 279354: jack and betty have 28 coins that are nickels and dimes if the value of the coins is \$1.95 how many coins of each type do they have Click here to see answer by JBarnum(2044)

 Question 279393: What is the slope of the line 4x+2y=10? Click here to see answer by richwmiller(9135)

 Question 279605: My homework is to graph systems of inequalities. The problem I'm having trouble with is: x-3y>(or equal to)-7 5x+y<(or equal to)13 x+6y>(or equal to)-9 3x-2y>(or equal to)-7 I have successfully graphed the first two, but I cannot figure out the third or last one yet. I graphed what I thought the third one looked like, but it didn't make any sense to the problem. I set the y-intercept at -1 1/3 with a slope of -9/6 which reduces to -3/2. Click here to see answer by Theo(3458)

 Question 279699: How do you solve systems by graphing... for example (2x+2y=5 & y=x-4)What would the steps be to solving this (or any) problem. Click here to see answer by Alan3354(30962)

 Question 279819: how do u solve the following problem: y=3x x+y=4 Click here to see answer by JBarnum(2044)

 Question 279894: Number One: 5x + 4y - z = 1 2x - 2y + z = 1 -x - y + z = 2 Number Two: x + y + z = 0 2x + 3y +2z = -1 x - y + z = 2 Number Three: x + 2y = 0 4x - z = 4 5y + z = -1 Click here to see answer by Edwin McCravy(8880)

 Question 279134: Please solve these three system equation for X and Y and Z. Equation1. X+10Y+Z=52 Equation2. 5X+Y+4Z=15 Equation3. X+2Y-3Z=12 Click here to see answer by JBarnum(2044)

 Question 280013: How do I solve the system using the substitution method and show work? 2x+3y=2 x+3y=10 Click here to see answer by nabla(475)
 Question 280013: How do I solve the system using the substitution method and show work? 2x+3y=2 x+3y=10 Click here to see answer by jsmallt9(3296)

 Question 280016: THE DISTANCE BETWEEN THE PLANE x + 2y - 2z = 3 and 2x + 4y - 4z = 7 Click here to see answer by nabla(475)

 Question 280099: train A is traveling at 60 mph and train B at 80 mph. train A passes the station at 810 and train B at 825 at what time will train B catch train A? Click here to see answer by josmiceli(9650)

 Question 280114: in 1992 life expectancy was 63.4. in 1998 it was 67.0 E= life expectanc in year t and let t = # of years since 1992 what is the linear function for this? what would the life expectancy be if E(16) Click here to see answer by richwmiller(9135)