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 188088: In recent decades, the percentage of the U.S. population age 16 and over that is in the work force has risen at a roughly constant rate, from 59.4% in 1960 to 66.6% in 2002. I need to find the equation describing the relationship. I believe I need to find the slope first. Which is the change in y1-y over x1-x. But I' don't know how to express this. Please help me find the equation. tom. Click here to see answer by stanbon(57323)

 Question 188101: Solve the following systems of equations: 2x - 2y - 2z = -2 -x + y + 3z = 0 -3x + 3y - 2z = 1 Click here to see answer by stanbon(57323)

 Question 188139: I'm having difficult time doing word problems for applications of linear equations. The number of pages in the U.S. tax code exceeds the number of pages in the King James Bible by 18,528. The combined number of pages in the U.S. tax code and the King James Bible is 21,472. Determine the number of pages in each. Thanks for any help you can give me. Click here to see answer by stanbon(57323)

 Question 188147: can you help me solve this : Convert this linear equation into standard form: y=4/3x-10 Click here to see answer by Mathtut(3670)

 Question 188169: -4(a+1)-3a=-7(2a-3) Coul someone show me how to work this out on paper Click here to see answer by checkley77(12569)

 Question 188170: A number increased by 2 thirds of the number 35 is? Could someone show me how to work this out on paper Click here to see answer by Alan3354(30993)

 Question 188185: im having troubles with this problem. it says to Solve the systems of linear equations using a graphing method y=2x-13 y=-3x+7 Click here to see answer by solver91311(16877)

 Question 188186: can i have help solving Solve the systems of linear equations using a graphing method 4x+2y=8 y=-2x+6 Click here to see answer by solver91311(16877)

 Question 188167: 2(x+6)= x -5 _____ 3 or 2(x+6)/3= x-5 Could someone show me how to work this out on paper Click here to see answer by jim_thompson5910(28593)

 Question 188142: I have a word problem need help on. In 2007, there were 13,300 student at college A, with a projected enrollment increase of 1000 students per year. In the same year, there were 26,800 students at college B, with a projected enrollment decline of 500 students per year. According to these projections, when will the colleges have the same enrollment? What will be the enrollment in each college at that time? Thanks for your help. Click here to see answer by dukesmart(20)

 Question 188234: can you please help me step by step through this problem ? Solve the systems of linear equations using a graphing method for questions : y=2x-13 y=-3x+7 Click here to see answer by solver91311(16877)

 Question 188220: I have two lines for a system of linear equations. They are y= -3/2x -215. and y= 7x +1026. I thried and I got x is -73/2 and y is 254.24. When I plug it in to check it they did not equal each other. Thank you for helping and any help you give would be great. Click here to see answer by checkley77(12569)

 Question 188216: what is the solution? Solve the systems of linear equations using a graphing method 4x+2y=8 y=-2x+6: a.no solution, parallel lines b.(3,2) c.(2,3) Click here to see answer by checkley77(12569)

 Question 188321: Please Help. At the end of the 2001 football season , the Cowboys and Broncos had won a total of 7 Super Bowls. The Cowboys had won 2.5 times as many Super Bowls as the Broncos. How many Super Bowls had the Cowboys won? Click here to see answer by solver91311(16877)

 Question 188387: You are choosing between 2 plans at a discount warehouse. Plan A offers an annual membership fee of \$300 and you pay 70% of the manufacturer's recommended list price. Plan B offers an anual membership fee of \$40 and you pay 90% of the manufacturer's recommended list price. How many dollars of merchandise would have to purchase in a year to pay the same amount under both plans? What will be the cost for each plan? Appreciate any help you can give me. Thanks Click here to see answer by stanbon(57323)

 Question 188386: The average life expectancy for American men born in 1900 was 55 years. Life expectancy has increased by about 0.2 year for each birth year after 1900. If this trend continues for which birth year will the average life expectancy be 91 years? I think the answer is 2080. I just don't know how to show this in algebraic terms. Click here to see answer by stanbon(57323)

 Question 188392: A bookcase is to be constructed. The length is to be 3 times the height. If 60 feet of lumber is available for the entire unit, find the length and height of bookcase. Thanks for your help. Click here to see answer by jojo14344(1512)

 Question 188389: A repair bill on a sailboat came to \$1603, including \$532 for parts and the remainder for labor. If the cost of labor is \$63 per hour, how many hours of labor did it take to repair the sailboat? Appreciate any help you can give me. Thanks Click here to see answer by stanbon(57323)
 Question 188389: A repair bill on a sailboat came to \$1603, including \$532 for parts and the remainder for labor. If the cost of labor is \$63 per hour, how many hours of labor did it take to repair the sailboat? Appreciate any help you can give me. Thanks Click here to see answer by jojo14344(1512)

 Question 188464: I need help on Addition and Subtraction of Linear Equations...The problem is 3x+y=17 -1x-x=23 Click here to see answer by stanbon(57323)

 Question 188144: The average life expectancy for American men born in 1900 was 55 years. Life expectancy has increased by about 0.2 year for each birth year after 1900. If this trend continues, for which birth year will the average life expentancy be 91 years? I think the answer is 2080. I just have no idea how to put this in algebraic terms. Click here to see answer by ankor@dixie-net.com(15649)

 Question 188473: How do you solve this linear system using substitution? 3/8x + 3/4y = 12 2/3x + 1/2y = 13 Click here to see answer by Alan3354(30993)

 Question 188521: Laura has \$4.50 in dimes and quarters. She has 3 more dimes than quarters. How many quarters does she have. How do you find two linear equations (y=mx+b), one that shows quantity of the coins. And one that shows the amount the coins are worth. I am suppose to use "d" and "q" to represent the dimes and quarters. So far I got: q=dx+3 and 4.50=qx+d Click here to see answer by solver91311(16877)
 Question 188521: Laura has \$4.50 in dimes and quarters. She has 3 more dimes than quarters. How many quarters does she have. How do you find two linear equations (y=mx+b), one that shows quantity of the coins. And one that shows the amount the coins are worth. I am suppose to use "d" and "q" to represent the dimes and quarters. So far I got: q=dx+3 and 4.50=qx+d Click here to see answer by feliz1965(151)

 Question 188573: The percentage of global energy used by China exceeds Russia by 6% and the percentage of global energy used by the United States exceeds Russia by 16.4%. Combined the U.S., China, and Russia consume 40.4% of the world's energy. Determine the percentage of global energy used by each country. Thanks for any help you can give me on this. I've been rereading and rereading problem and can't think of how to do it. Click here to see answer by josmiceli(9671)

 Question 188800: How do I solve the follwoing system of equations? y = + 4 y = 2x + 1 Can you provide a detailed answer showing all of the steps? Click here to see answer by jim_thompson5910(28593)
 Question 188800: How do I solve the follwoing system of equations? y = + 4 y = 2x + 1 Can you provide a detailed answer showing all of the steps? Click here to see answer by Alan3354(30993)

 Question 188829: Solve the system of equations + = 169 -8y = 104 Could you please prvide me with a detailed explanation of how you achieved the solution. Thanks! Click here to see answer by ankor@dixie-net.com(15649)

 Question 188294: Two people start driving toward each other on the same highway at the same time from towns 420 miles apart. One car travels 15 mph faster then the other. what is the rate of each other if they meet in 4 hrs. answer: The first car travels at 60 mph; the second car travels at 45 mph. need a full break down of how my text book got this answer Click here to see answer by jojo14344(1512)

 Question 189014: describe the steps you would use to solve the inequality 7a-4<17 Click here to see answer by solver91311(16877)
 Question 189014: describe the steps you would use to solve the inequality 7a-4<17 Click here to see answer by jonvaliente(64)

 Question 187938: i want to solve thisimultaneous equation 5x-5y=5,4x-3y=25 i took the first equation x=5+5y/5 and them 4(5-5y)/5-3y=25 i donīt understand the siplpification Click here to see answer by Alan3354(30993)

 Question 189154: [This question must be solved by graphing] My problenm is: y=1 y=x How do I do it. it seems simple but it is very hard Click here to see answer by ankor@dixie-net.com(15649)

 Question 189257: A chemist has 1000g 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 Alan3354(30993)

 Question 189235: what is a solution for the system of equations and y+1=x Click here to see answer by Alan3354(30993)

 Question 188001: Solve each system of equatons. 3x - 4y - 7z = -5 2x + 3y - 5z = 2 Click here to see answer by Alan3354(30993)