# 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 471405: Solve by substitution method and what is the solution set? 15x-10y=5 15y=-6+15x Click here to see answer by faceoff57(82)

 Question 471402: Solve by elimination method and what is the solution set? 3x-7y=15 -5x+4y=-25 Click here to see answer by mananth(12270)

 Question 471616: A rental car agency charges \$15 per day plus 11 cents per mile to rent a certain car. Another agency charges \$21 per day plus 5 cents per mile to rent the same car. How many miles will have to be driven in one day for the cost of a car from the first agency to equal the cost of a car from the second agency in one day? (Express the problem as a system of linear equations and solve by any method). Click here to see answer by jorel1380(2518)

 Question 471617: Tasty Bakery sells three kinds of muffins: chocolate chip muffins at 30 cents each, oatmeal muffins at 35 cents each, and cranberry muffins at 40 cents each. Charles buys some of each kind and chooses twice as many cranberry muffins as chocolate chip muffins. If he spends \$4.65 on 13 muffins, how many oatmeal muffins did he buy? Click here to see answer by jorel1380(2518)

 Question 471629: x+y+z=6 2x-y+z=8 x-2y-z=-19 I need help solving these systems of equations. Click here to see answer by MathLover1(6634)

 Question 471806: A boy rows his boat 8 km downstream in 1 hour and 4 minutes, and returns in 2 2/7 hour at what rate will he row in still water? what is the rate of the current ? Click here to see answer by stanbon(57361)

 Question 472332: can you solve a linear system by using substitution? Click here to see answer by ewatrrr(10682)

 Question 472573: An airplane travels 500 miles against the wind in 4 hours, and makes the return trip with the same wind in 2 hours. Find the rate of the wind. Click here to see answer by jorel1380(2518)

 Question 472575: During the 1998-1999 Junior hockey league season, the Sharks played 64 games. Together their wins ans losses totaled 57. they tied 15 fewer games than they lost. how many games did they tie that season? Click here to see answer by jorel1380(2518)

 Question 472578: The number of enrollees in health organizations in Illinois in a recent year was 2,429,275. this was a 41.2% increase over the previous year. What was the former number of enrollees? Click here to see answer by jorel1380(2518)

 Question 472581: A company makes 3 types of cables. Cable A requires 3 black, 3 white, and 2 red wires. B requires 1 black, 2 white, and 1 red. C requires 2 black, 1 white, and 2 red. They used 100 black, 110 white, and 90 red wires. How many of each cable were made? Click here to see answer by ankor@dixie-net.com(15652)

 Question 473168: There are 357 calories in two slices of bread and three eggs. There are 217 calories in one slice of bread and two eggs. How many calories are in a slice of bread and how many are in an egg Click here to see answer by karaoz(32)

 Question 473192: write an equation for slope=0 and passes through (4,6) Click here to see answer by MathLover1(6634)
 Question 473192: write an equation for slope=0 and passes through (4,6) Click here to see answer by ewatrrr(10682)

 Question 473191: write an equation for slope=2/5 and passes through (5,7) Click here to see answer by MathLover1(6634)
 Question 473191: write an equation for slope=2/5 and passes through (5,7) Click here to see answer by ewatrrr(10682)

 Question 473461: Hello, Math is a nightmare for me and would appreciate some help with this linear equation. I need to solve : -10.8x + 1.4 = -47.6 - 1.0x Click here to see answer by ankor@dixie-net.com(15652)

 Question 473901: If a person is twice as old as his brother. 3 years ago the sum of their ages was 27. Find the age of the brothers. Click here to see answer by algebrahouse.com(1079)

 Question 473955: In 1992 the life expectancy of males in a certein country was 64.1 years. In 1996, it was 66.5 years. let E represent the life expectancy in year t and let t represent the number of years sence 1992. The linear function E(t) that fits the data is? Click here to see answer by josmiceli(9681)

 Question 474110: An airplane flies from Pittsburgh to harrisburg in 1.5 hours and returns in 2 hours. If the wind speed is 16 miles per hour blowing from the west, find the air speed of the plane Click here to see answer by ewatrrr(10682)

 Question 474427: how can i answer this y > 1 + 3x y < 2x + 4 Click here to see answer by Theo(3464)

 Question 474504: I tried solving this system of equations, but my answer seems totally off. If someone could please show me where I went wrong, I'd appreciate it! Solve the system of equations using the elimination method. 4x+3y=3 5x-9y=144 I multiplied the second equation by 3 to eliminate the y variable. After adding the two equations and solving for x, I got 10 1/17. + __________________ Then I substituted my x-value into the original first equation to solve for y. Thus, my answer was (171/17, -211/17) Click here to see answer by mananth(12270)

 Question 474622: Part 1: Decide whether you would use the graphing, substitution, or elimination method to solve the following system of equations. Explain, in complete sentences, why you chose that method. Part 2: Solve the following system of equations and show all of your work. 2x + 5y = −3 −15x − 5y = −10 Click here to see answer by richard1234(5390)

 Question 474909: 6. Our equation y = 2.09x + 15.50 represents our charge for hats. An estimate from a competing company, Lotsa Hats, was -2.09x + y = 13.30. A. Do you expect these lines to be parallel, perpendicular, or intersecting? Why? B. Use the equations to determine if the lines are parallel. Are they? Why or why not? Click here to see answer by mananth(12270)

 Question 474969: how do I work out the answer to this equation 1/r-1/[r(1+r)^t] in the equation r is the annual interest rate and t is th length of time in years,in this case the interest rate r is 8% and the time in years t is 70. i think the answer is 12.4428. but in what form of maths do i work it out in. please help thank you Click here to see answer by stanbon(57361)

 Question 474992: Use the substitution method to solve the system of equations. Enter your answer as an ordered pair. y = 5x - 17 y = x + 3 Click here to see answer by mananth(12270)

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