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

Tutors Answer Your Questions about Linear-systems (FREE)

Question 175230: Please solve x + 1 = 2/3x algrbracially. Please, step by step, I need to see how the answer is -3. Cannot figure this out.
Click here to see answer by EMStelley(187)

Question 175230: Please solve x + 1 = 2/3x algrbracially. Please, step by step, I need to see how the answer is -3. Cannot figure this out.
Click here to see answer by monika_p(71)

Question 175230: Please solve x + 1 = 2/3x algrbracially. Please, step by step, I need to see how the answer is -3. Cannot figure this out.
Click here to see answer by solver91311(16885)

Question 175260: what is x=y+4
2x+3y=43
Click here to see answer by jim_thompson5910(28595)

Question 175309: How to solve the algebra equation (-1,6);m=5
Click here to see answer by Mathtut(3670)

Question 175338: I am having trouble understanding, "solving systems of equations by graphing."
Ex:
x+y=6
x-y=4
Then, I started to try and solve and find the ordered pair that worked for both equations. I only got this far, then I get confused:
x+y=6
-x -x
______
y=-1x+6

x-y=4
-x -x
_______
-y=-1+4

Click here to see answer by KnightOwlTutor(293)

Question 175455: how do i solve for y=4x-1 y=2x-5 using substitution

Click here to see answer by Fombitz(13828)

Question 175524: Please help me solve this equation: y=3x
x=3y
Click here to see answer by solver91311(16885)

Question 175524: Please help me solve this equation: y=3x
x=3y
Click here to see answer by Alan3354(30993)

Question 175562: The number of girls at Sky High School is 60 greater than the number of boys. If there are 1250 students all together, how many girls are there all together?
Click here to see answer by jim_thompson5910(28595)

Question 175610: question. 3x=4y-5
would like a detail answer so I can apply the formula to the rest of questions.
I am very quick at math but have not been using such math and have forgottem formulas so I can help my son.
Thanks Fred
Click here to see answer by Mathtut(3670)

Question 175656: need help solving number 18 through 34 even
Click here to see answer by Mathtut(3670)

Question 175694: how do I solve the system of equations: 2x+3y=40 and -2x+2y=20?
Click here to see answer by jim_thompson5910(28595)

Question 175693: Please help me solve this equation: the sum of two numbers is 13. Two times the first number minus three times the second number is 1. If you let x stand for the first number and y for the second number, what are the two numbers?
Click here to see answer by jim_thompson5910(28595)

Question 175696: If one number is equal to two times a second number. Two times the first number plus two times the second number is 24. If you let x stand for the first number and y for the second, what are the two numbers?
Click here to see answer by jim_thompson5910(28595)

Question 175700: How do I find the system of equations 3y+2z=12 and y-z=9?
Click here to see answer by jim_thompson5910(28595)

Question 175702: What is the system of equations 2r+2s=50 and 2r-s=17?
Click here to see answer by jim_thompson5910(28595)

Question 175770: At most 500 feet of fencing is available for a steer pasture(assuming it's a rectangle). Ther is only space for the pasture to be 100 feet wide.
a. Write a system of two linear inequalities that describe this situation.
y < or = 100, with y being the width
2y + 2x < or equal to 500, which became y < or equal to -x + 250
b. Graph the system to show all possible solutions.
Drew a horizontal line on graph at y-axis 100, and shaded below the line.
Wasn't sure what to do with 2nd equation in graphing, particularly the slope. Feeling really stupid about this. :) :( Thanks for any help possible!

Click here to see answer by josmiceli(9680)

Question 175894: The percentage of women in the 20–24 age
group who have never married went from 55% in 1970 to
73% in 2000 (Census Bureau, www.census.gov). Let 1970
be year 0 and 2000 be year 30.
a) Find and interpret the slope of the line through the
points (0, 55) and (30, 73).
b) Find the equation of the line in part (a).
c) What is the meaning of the y-intercept?
d) Use the equation to predict the percentage in 2010.
e) If this trend continues, then in what year will the
percentage of women in the 20–24 age group who have
never married reach 100%?
Click here to see answer by EMStelley(187)

Question 175915: Solve each system by the substitution method.
x+3y=2 and -x+y=1
Click here to see answer by jim_thompson5910(28595)

Question 175918: Solve the system by graphing; plotting on the graph
3x-5y=-9
5x-6y=-8
and
4x+5y=-2
4y-x=11
Click here to see answer by jim_thompson5910(28595)

Question 175920: Solve each system by addition
x-2y=-1
-x+5y=4
and
3x+5y=-11
x-2y=11
Click here to see answer by jim_thompson5910(28595)

Question 175923: Solve each system by the addition method. Determine whether the equations are independent, dependent, or inconsistent.
x-y=3
-6x+6y=17
Click here to see answer by jim_thompson5910(28595)

Question 175924: Solve each system by addition.
2x=2-y
3x+y=-1
Click here to see answer by EMStelley(187)

Question 175935: Solve each system by the addition method. Determine whether the equations are independent, dependent, or inconsistent.
x-y=3
-6x+6y=17
Click here to see answer by jim_thompson5910(28595)

Question 175938: x-y=-1
2x-3y=-5
Click here to see answer by jim_thompson5910(28595)

Question 175939: Graph these equations
4x+5y=-2
4y-x=11
Click here to see answer by stanbon(57347)

Question 175937: Solve each system by the addition method.
3x-2.5y=7.125
2.5x-3y=7.3125
Click here to see answer by stanbon(57347)

Question 175936: Solve each system by the addition method.
3/7x+5/9y=27
1/9x+2/7y=7
Click here to see answer by josmiceli(9680)

Question 175926: Solve the system by graphing; plotting on the graph
4x+5y=-2
4y-x=11
Click here to see answer by josmiceli(9680)

Question 175921: Solve each system by the addition method.
3/7x+5/9y=27
1/9x+2/7y=7
and
3x-2.5y=7.125
2.5x-3y=7.3125
Click here to see answer by Alan3354(30993)

Question 175971: Mario's age is two years more than twice Nadia's age. In nine years the sum of their ages will be 2/3 of his.
How do I solve???
Click here to see answer by josmiceli(9680)

Question 175893: Demand equation. Helen’s Health Foods usually sells
400 cans of ProPac Muscle Punch per week when the price
is $5 per can. After experimenting with prices for some
time, Helen has determined that the weekly demand can
be found by using the equation
d = 600 - 40p,
where d is the number of cans and p is the price per can.
a) Will Helen sell more or less Muscle Punch if she raises
her price from $5?
b) What happens to her sales every time she raises her
price by $1?
c) Graph the equation.
d) What is the maximum price that she can charge and
still sell at least one can?
Click here to see answer by ankor@dixie-net.com(15652)

Question 175986: I am sorry I need help with
Find the zeros of the function
f(x)= x^2 - 10x + 74
I typed it incorrect last time. I am sorry. Please help me.
Click here to see answer by stanbon(57347)

Question 175997: Find two numbers whose sum is 66 and whose difference is 12.
We will call the two numbers x and y
x=?
y=?

Click here to see answer by Alan3354(30993)

Question 175991: Find the values of x and y that solve the following system of equations.
-5x+3y=8
-9x+5y=14
Click here to see answer by tran3209(100)

Question 176001: Find two numbers whose sum is 47 and whose difference is 7.
We will call the two numbers x and y.)
x=?
y=?
Click here to see answer by Mathtut(3670)

Question 175994: Find the values of x and y that solve the following system of equations.
-7x+9y=-12
-6x+5y=6
Click here to see answer by tran3209(100)

Question 176008: Solve the system by substitution.
y=2x+4
y=-1/2x+3/2
Click here to see answer by checkley75(3666)

Question 176008: Solve the system by substitution.
y=2x+4
y=-1/2x+3/2
Click here to see answer by tran3209(100)

Question 176009: Solve the system by substitution.
y=2x-3
y=x-2
Click here to see answer by Mathtut(3670)

Question 176009: Solve the system by substitution.
y=2x-3
y=x-2
Click here to see answer by checkley75(3666)

Question 176004: Flying against the jetstream, a jet travels 2920km in 4 hours. Flying with the jetstream, the same jet travels 7630km in 7 hours. What is the speed of the jet in still air, and what is the speed of the jetstream?

Click here to see answer by Alan3354(30993)

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