# 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 129475: the sun of two numbers is 20 their difference is 4 b. Solve by elimination to find the two numbers Click here to see answer by idkweirdo(15)

 Question 129540: solve for x (9/4x)+(1/3)=(5/2x) I don't even know where to begin Click here to see answer by ilana(307)

 Question 129570: I got stuck on this system problem. I always ended up with something odd like "-5" by itself. Help! -3x + 3y = 4 -x + y = 3 Click here to see answer by jim_thompson5910(28598)
 Question 129570: I got stuck on this system problem. I always ended up with something odd like "-5" by itself. Help! -3x + 3y = 4 -x + y = 3 Click here to see answer by bucky(2189)

 Question 129601: I don't understand how to work this problem which is on page 408 systems of linear equations by substitution the problems is y=3x x=3y Click here to see answer by bucky(2189)

 Question 129650: A goldsmith has two alloys that are different purities of gold. The first is three-fourthspure gold and the second is five-twelfths pure gold. How many ounces of each should be melted and mixed in order to obtain a 6-oz mixture that is two-thirds pure gold? Click here to see answer by josmiceli(9697)

 Question 129653: I need to write the slope-intercept form of the equation of the line that is perpendicular to 7x-8y= -2 and contains the point(6,3). I cannot get passed this step: y-3= -8/7(x-6), how do you multiply -8/7 * -6? Click here to see answer by checkley71(8403)

 Question 129682: I need help to solve this system using substitution Click here to see answer by checkley71(8403)

 Question 129649: The problem states that an employer has a daily payroll of \$1225 when employing some workers at \$80 per day and others at \$85 per day. When the number of \$80 workers is increased by 50% and the number of \$85 workers is decreased by 1/5, the new daily payroll is \$1540. How many were originally employed at each rate? Click here to see answer by checkley71(8403)

 Question 129700: 18. Education: A writing workshop enrolls novelists and poets in a ratio of 5 to 3. There are 24 people at the workshop. How many novelists are there? How many poets are there? Click here to see answer by checkley71(8403)
 Question 129700: 18. Education: A writing workshop enrolls novelists and poets in a ratio of 5 to 3. There are 24 people at the workshop. How many novelists are there? How many poets are there? Click here to see answer by stanbon(57387)

 Question 129725: Chemist must mix 30 % insecticide soln with 50% insecticide soln. (same insecticide) to obtain 200 L of a 42 % insecticide soln. Please help with 2 stage linear system of equation and demonstrate resolution. THX Click here to see answer by checkley71(8403)

 Question 129782: Mr.Lim buys 30kg of cheese at a certain price. She finds that if she had bought some cheaper cheese costing 95 cents less per kg , she could have had 32.5kg for the same amount of money . What is the price per kg of the cheese which is more expensive ? Sir, help me Please Click here to see answer by oscargut(891)
 Question 129782: Mr.Lim buys 30kg of cheese at a certain price. She finds that if she had bought some cheaper cheese costing 95 cents less per kg , she could have had 32.5kg for the same amount of money . What is the price per kg of the cheese which is more expensive ? Sir, help me Please Click here to see answer by solver91311(16897)
 Question 129782: Mr.Lim buys 30kg of cheese at a certain price. She finds that if she had bought some cheaper cheese costing 95 cents less per kg , she could have had 32.5kg for the same amount of money . What is the price per kg of the cheese which is more expensive ? Sir, help me Please Click here to see answer by josmiceli(9697)

 Question 129781: A man travels regularly between two cities . He takes 14/3hours , if he travels at his usual speed . He finds that if he increases his speed by 3km/h , he can reduce the time by 1/3 hour . What is his usual speed ? Pls help Click here to see answer by oscargut(891)
 Question 129781: A man travels regularly between two cities . He takes 14/3hours , if he travels at his usual speed . He finds that if he increases his speed by 3km/h , he can reduce the time by 1/3 hour . What is his usual speed ? Pls help Click here to see answer by josmiceli(9697)
 Question 129781: A man travels regularly between two cities . He takes 14/3hours , if he travels at his usual speed . He finds that if he increases his speed by 3km/h , he can reduce the time by 1/3 hour . What is his usual speed ? Pls help Click here to see answer by test101(1)

 Question 129862: A car travels from one town to another at a speed of 32 mph. If it had gone 4 mph faster, it could have made the trip in 1/2 hr less time. How far apart are the towns? Click here to see answer by checkley71(8403)

 Question 129861: A student walks and jogs to college each day. She averages 5 km/h walking and 9 km/h jogging. The distance from home to college is 8 km, and she makes the trip in 1 hr. How far does the student jog? Click here to see answer by checkley71(8403)

 Question 129891: The problem states to solve the system of equations by graphing. x + y = 4 x + y = -4 I came up with this problem as having no solution. Am I correct? Click here to see answer by checkley71(8403)

 Question 129889: Solve the system of equations by graphing. -3x = 5 - y 2y = 6x + 10 I had x = -1 and y = 2, but I don't know if that's right. Any help would be appreciated. Click here to see answer by checkley71(8403)

 Question 130042: solve the system. Assume that a and b represent nonzero constants. ax+by=6 ax-3by=4 The x value of the solution is: Click here to see answer by stanbon(57387)

 Question 130068: An antique dealer found a 14K gold statue at an auction. In order to maximize profits from this statue, it was melted down with cheap 6K gold trinkets to produce 8K gold replica. If the replica has a mass of 3.2Kg, what were the masses of the statue and the trinkets used? Click here to see answer by checkley71(8403)

 Question 130040: solve the following system of equations by the substitution method: 4x=3y+30 3y-5x=-33 after substituting, find the remaining equation and the y coordinate of the solution. Click here to see answer by checkley71(8403)

 Question 130110: Where do I begin with this equation? The value of a home bought in 1990 appreciates, or increases as time passes. Seven years after it was bought, the house was worth \$165,000. Twelve years after the purchase of the house, the house was worth \$180,000. a. If the relationshi is LINEAR, write an equation that describes this relationship.(HINT: Start by writing two ordered pairs!) b. Estimate the value of the house in the year 2005, which is 15 years after the purchase of the home. Click here to see answer by stanbon(57387)

 Question 130247: srry lost my other account password the ones next to each other are all one problem x=y+1 x+2y=7 3x-y=2 y=2x-9 Click here to see answer by jim_thompson5910(28598)

 Question 130037: concert tickets: tickets for a concert cost \$5, \$3, and \$2. twice as many \$5 tickets were sold as \$2 tickets. the recipts for 750 tickets were \$2625. haw many of each price ticket were sold? [i have no clue how ti set this up] Click here to see answer by scott8148(6628)

 Question 130267: The sum of the digits of a certain two-digit number is 7. Reversing its digits increases the number by 9. What is the number? I know that the answer is 34, and I know that one of the equations is x+y=7, but I do not know the other part to the system of equations. Thanks for helping me!!! Click here to see answer by ilana(307)

 Question 130320: i am absolutly confused on this question ive tried several different angles: 5x+2y+z=-11 2x-3y-z= 17 7x+y2+z= -4 Click here to see answer by ilana(307)

 Question 130266: The sum of the digits of a certain two-digit number is 7. Reversing its digits increases the number by 9. What is the number? I know that the answer is 34, and I know that one of the equations is x+y=7, but I do not know the other part to the system of equations. Thanks for helping me!!! Click here to see answer by solver91311(16897)

 Question 130331: My study question asks....Solve the following systems of equation by any method. All I am asking for is the name of a method so I can look up the order or way to solve it. 3x-2y=12 and 2x+y=8 Thanks! Click here to see answer by jim_thompson5910(28598)

 Question 130788: How do you determine consistency from using the elimination method? Click here to see answer by solver91311(16897)

 Question 130973: How do I solve for the absolute value inequality: x > 6 Click here to see answer by jim_thompson5910(28598)

 Question 130899: To make ends meet, Ms. Farnsby works three jobs. Her total income last year was \$48,000. Her income from teaching was just \$6,000 more than her income from house painting. Royalties from her text book sales were one-seventh of the total money she recieved from teaching and house painting. HOw much did she make from each source last year? Click here to see answer by edjones(7569)

 Question 130982: find the equation of the line containing a given pair of points. (-2,-7)(-9,-5) the equation of the line is y= ??? Click here to see answer by jim_thompson5910(28598)