Questions on Algebra: Systems of Linear Equations answered by real tutors!

Tutors Answer Your Questions about Linear-systems (FREE)

Question 473188: Please help me solve this equation.
solve the linear system.
5x+5y=-1
y=-x
Click here to see answer by ewatrrr(24785)

Question 473192: write an equation for slope=0 and passes through (4,6)
Click here to see answer by MathLover1(20850)

Question 473192: write an equation for slope=0 and passes through (4,6)
Click here to see answer by ewatrrr(24785)

Question 473191: write an equation for slope=2/5 and passes through (5,7)
Click here to see answer by MathLover1(20850)

Question 473191: write an equation for slope=2/5 and passes through (5,7)
Click here to see answer by ewatrrr(24785)

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(22740)

Question 473703:
Click here to see answer by ashleighb84(7)

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(1659)

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(19441)

Question 474099: graph the equation by plotting points
y=x+2
Click here to see answer by ewatrrr(24785)

Question 474098: graph the equation by plotting points
y=x-5
Click here to see answer by ewatrrr(24785)

Question 474096: graph the following by plotting points
y=x+6
Click here to see answer by ewatrrr(24785)

Question 474100: graph the equation by plotting points
y=-5x
Click here to see answer by ewatrrr(24785)

Question 474100: graph the equation by plotting points
y=-5x
Click here to see answer by MathLover1(20850)

Question 474100: graph the equation by plotting points
y=-5x
Click here to see answer by Alan3354(69443)

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(24785)

Question 474156: -3 = 9+4c
Click here to see answer by rfer(16322)

Question 474427: how can i answer this y > 1 + 3x
y < 2x + 4

Click here to see answer by Theo(13342)

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(16946)

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(7193)

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(16946)

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(75887)

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(16946)

Question 475257: 3x+2y=5
x=y-5
solves the linear equations by substitution
Click here to see answer by rfer(16322)

Question 475254: Assume that y varies directly as x. if y=-8 when x=-3, find x when y=6. leave answer in fractional form
Click here to see answer by robertb(5830)

Question 475595:
Please help me solve the system of equation:
-2x-5y-z=57
-5y-2z=54
-5z=35

Click here to see answer by Edwin McCravy(20056)

Question 475635: for the opening day of a carnival, 800 admission tickets were sold. the receipts totaled $3775. tickets for children cost $3 each, tickets for adults cost $8 each, and tickets for senior citizens cost $5 each. there were twice as many childre's tickets sold as adult tickets. How many of each type of ticket were sold?
Click here to see answer by lwsshak3(11628)

Question 475723: What is the equation in point-slope form of the line with x-intercept of 3 and y-intercept of -5.
Click here to see answer by stanbon(75887)

Question 475723: What is the equation in point-slope form of the line with x-intercept of 3 and y-intercept of -5.
Click here to see answer by mananth(16946)

Question 475726: what is the equation in point-slope form of the line perpendicular to 3x+6y=5 and through the point (1,3).

Click here to see answer by stanbon(75887)

Question 475804: the sum of two numbers is 41, the larger number is 1 less than twice the smaller number: translate the word problem into a system of two linear equations.
After you have the two equations then show work to solve.
This is a discussion post question. THank you for your help!
Click here to see answer by ankor@dixie-net.com(22740)

Question 475986: Help me solve the equation elimination method
5u-v=0
3u+3v=-18
Click here to see answer by Tatiana_Stebko(1539)

Question 476155: how to graph
x<6
Click here to see answer by rfer(16322)

Question 476360: DOES THE EQUATION 3Y=2X REPRESENT DIRECT VARIATION
Click here to see answer by stanbon(75887)

Question 476367: THE WEIGHT OF AN OBJECT ON THE MOON VARIES DIRECTLY AS ITS WEIGHT ON EARTH. WITH ALL OF HIS GEAR ON, NEIL ARMSTRONG WEIGHED 360 POUNDS ON EARTH. WHEN HE BECAME THE FIRST PERSON TO STEP ON THE MOON ON JULY 20, 1969, HE WEIGHED 60 POUNDS. TARA WEIGHS 108 POUNDS ON EARTH. WHAT WOULD SHE WEIGH ON THE MOON.
Click here to see answer by stanbon(75887)

Question 476363: WHAT IS THE CONSTANT OF VARIATION FOR THE DIRECT VARIATION EQUATION Y=2/3X
Click here to see answer by stanbon(75887)

Question 476374: IN 1990, PEOPLE IN THE UNITED STATES SPENT ABOUT 285.7 BILLION ON RECREATION. IN 1995, THEY PWNT 402.5 BILLION. FIND THE SLOPE OF THE LINE THROUGH THE TWO POINTS DEFINED DEFINED BY THE RECREATIONAL DATA. WHAT DOES THE SLOPE TELL YOU.
Click here to see answer by stanbon(75887)

Question 476489: Solve the system: 2x+3y=5 3x-2y=-4
Click here to see answer by MathLover1(20850)

Question 476503: 2x+3y=8
3x+2y=7
I have to determind how many solutions exit.
Use either elimination or substitution to find solutions.
I have tried and my teacher told me I had every question wrong. I am lost please help.
Click here to see answer by mananth(16946)

Question 476510: A university bookstore recently sold a wirebound graph-paper notebook for $2.50, and a college-ruled notebook for $2.30. At the start of spring semester, a combination of 50 of these notebooks were sold for a total of $118.60. How many of each type were sold?

I am no good with word problems. I got the answer of 25 and 27 but could not give the equation and my teacher said it was wrong. I don't know.
Click here to see answer by scott8148(6628)

Question 476530: A shopper buys 3 oranges and 5 lemons for $10.26, while a second shopper buys 4 lemons and 6 oranges for $11.16. What is the price of each fruit?
I got 3x+5y=10.26 and 4x+6y=11.16
I gave the answer of x=2.88 y=.324 but i was wrong.
Click here to see answer by bucky(2189)

Question 476581: The solution of 8+8 is 1000. how can i solve this?
Click here to see answer by Theo(13342)

Question 476586: A number is 4 times the sum of its digits.The units digit is two more than the tens digit.Find the number.
Click here to see answer by ankor@dixie-net.com(22740)

Question 476706: can you help me answer 8-5r over 6=3, -4a-1 over -10a=3/8, and y+4 over y-1=4/3

-thanks
Click here to see answer by stanbon(75887)

Older solutions: 1..45, 46..90, 91..135, 136..180, 181..225, 226..270, 271..315, 316..360, 361..405, 406..450, 451..495, 496..540, 541..585, 586..630, 631..675, 676..720, 721..765, 766..810, 811..855, 856..900, 901..945, 946..990, 991..1035, 1036..1080, 1081..1125, 1126..1170, 1171..1215, 1216..1260, 1261..1305, 1306..1350, 1351..1395, 1396..1440, 1441..1485, 1486..1530, 1531..1575, 1576..1620, 1621..1665, 1666..1710, 1711..1755, 1756..1800, 1801..1845, 1846..1890, 1891..1935, 1936..1980, 1981..2025, 2026..2070, 2071..2115, 2116..2160, 2161..2205, 2206..2250, 2251..2295, 2296..2340, 2341..2385, 2386..2430, 2431..2475, 2476..2520, 2521..2565, 2566..2610, 2611..2655, 2656..2700, 2701..2745, 2746..2790, 2791..2835, 2836..2880, 2881..2925, 2926..2970, 2971..3015, 3016..3060, 3061..3105, 3106..3150, 3151..3195, 3196..3240, 3241..3285, 3286..3330, 3331..3375, 3376..3420, 3421..3465, 3466..3510, 3511..3555, 3556..3600, 3601..3645, 3646..3690, 3691..3735, 3736..3780, 3781..3825, 3826..3870, 3871..3915, 3916..3960, 3961..4005, 4006..4050, 4051..4095, 4096..4140, 4141..4185, 4186..4230, 4231..4275, 4276..4320, 4321..4365, 4366..4410, 4411..4455, 4456..4500, 4501..4545, 4546..4590, 4591..4635, 4636..4680, 4681..4725, 4726..4770, 4771..4815, 4816..4860, 4861..4905, 4906..4950, 4951..4995, 4996..5040, 5041..5085, 5086..5130, 5131..5175, 5176..5220, 5221..5265, 5266..5310, 5311..5355, 5356..5400, 5401..5445, 5446..5490, 5491..5535, 5536..5580, 5581..5625, 5626..5670, 5671..5715, 5716..5760, 5761..5805, 5806..5850, 5851..5895, 5896..5940, 5941..5985, 5986..6030, 6031..6075, 6076..6120, 6121..6165, 6166..6210, 6211..6255, 6256..6300, 6301..6345, 6346..6390, 6391..6435, 6436..6480, 6481..6525, 6526..6570, 6571..6615, 6616..6660, 6661..6705, 6706..6750, 6751..6795, 6796..6840, 6841..6885, 6886..6930, 6931..6975, 6976..7020, 7021..7065, 7066..7110, 7111..7155, 7156..7200, 7201..7245, 7246..7290, 7291..7335, 7336..7380, 7381..7425, 7426..7470, 7471..7515, 7516..7560, 7561..7605, 7606..7650, 7651..7695, 7696..7740, 7741..7785, 7786..7830, 7831..7875, 7876..7920, 7921..7965, 7966..8010, 8011..8055, 8056..8100, 8101..8145, 8146..8190, 8191..8235, 8236..8280, 8281..8325, 8326..8370, 8371..8415, 8416..8460, 8461..8505, 8506..8550, 8551..8595, 8596..8640, 8641..8685, 8686..8730, 8731..8775, 8776..8820, 8821..8865, 8866..8910, 8911..8955, 8956..9000, 9001..9045, 9046..9090, 9091..9135, 9136..9180, 9181..9225, 9226..9270, 9271..9315, 9316..9360, 9361..9405, 9406..9450, 9451..9495, 9496..9540, 9541..9585, 9586..9630, 9631..9675, 9676..9720, 9721..9765, 9766..9810, 9811..9855, 9856..9900, 9901..9945, 9946..9990, 9991..10035, 10036..10080, 10081..10125, 10126..10170, 10171..10215, 10216..10260, 10261..10305, 10306..10350, 10351..10395, 10396..10440, 10441..10485, 10486..10530, 10531..10575, 10576..10620, 10621..10665, 10666..10710, 10711..10755, 10756..10800, 10801..10845, 10846..10890, 10891..10935, 10936..10980, 10981..11025, 11026..11070, 11071..11115, 11116..11160, 11161..11205, 11206..11250, 11251..11295, 11296..11340, 11341..11385, 11386..11430, 11431..11475, 11476..11520, 11521..11565, 11566..11610, 11611..11655, 11656..11700, 11701..11745, 11746..11790, 11791..11835, 11836..11880, 11881..11925, 11926..11970, 11971..12015, 12016..12060, 12061..12105, 12106..12150, 12151..12195, 12196..12240, 12241..12285, 12286..12330, 12331..12375, 12376..12420, 12421..12465, 12466..12510, 12511..12555, 12556..12600, 12601..12645, 12646..12690, 12691..12735, 12736..12780, 12781..12825, 12826..12870, 12871..12915, 12916..12960, 12961..13005, 13006..13050, 13051..13095, 13096..13140, 13141..13185, 13186..13230, 13231..13275, 13276..13320, 13321..13365, 13366..13410, 13411..13455, 13456..13500, 13501..13545, 13546..13590, 13591..13635, 13636..13680, 13681..13725, 13726..13770, 13771..13815, 13816..13860, 13861..13905, 13906..13950, 13951..13995, 13996..14040, 14041..14085, 14086..14130, 14131..14175, 14176..14220, 14221..14265, 14266..14310, 14311..14355, 14356..14400, 14401..14445, 14446..14490, 14491..14535, 14536..14580, 14581..14625, 14626..14670, 14671..14715, 14716..14760, 14761..14805, 14806..14850, 14851..14895, 14896..14940, 14941..14985, 14986..15030, 15031..15075, 15076..15120, 15121..15165, 15166..15210, 15211..15255, 15256..15300, 15301..15345, 15346..15390, 15391..15435, 15436..15480, 15481..15525, 15526..15570, 15571..15615, 15616..15660, 15661..15705, 15706..15750, 15751..15795, 15796..15840, 15841..15885, 15886..15930, 15931..15975, 15976..16020, 16021..16065, 16066..16110, 16111..16155, 16156..16200, 16201..16245, 16246..16290, 16291..16335, 16336..16380, 16381..16425, 16426..16470, 16471..16515