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

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Question 217605: Two sides of a triangle are 3 feet and 6 feet longer than the third side of the triangle, respectively. If the perimeter of the triangle is 36 feet, find the length of each side.
Click here to see answer by rfer(12666)

Question 217604: The third side of an isosceles triangle is 2 inches shorter than each of the other two sides. If the perimeter of this triangle is 67 inches, find the length of each side.
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Question 217751: Area of painting: A rectangular painting with a width of x centimeters has an area of x^2 + 50x square centimeters. Find a binomial that represents the length. Area = x^2 + 50x cm^2
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Question 217789: Use the intercept method to graph x-y=3. help
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Question 217868: Find an equation of the linear function f using the given info... m=4,b=1, formula is y=mx+b
Click here to see answer by checkley77(12569)

Question 218217: Of the 38, 123 ofices, stations, and branches of the US Postal service in 2001, 27,876 were actually classified as post offices. What percent to the nearest tenth were classified as post offices?
Click here to see answer by stanbon(57377)

Question 218232: Hi this is a system of equations with 3 variables.
4x-3y-2z=-5
3x+2y+7z=9
-2x+5y+8z=1
What are the values for x, y, and z? Thank you.
Click here to see answer by Alan3354(30993)

Question 218279: give the corrdinates of intersection of the linear equations
2x+y= -4
4x+2y=-8
Click here to see answer by jim_thompson5910(28595)

Question 218322: I'm trying to solve by elimination but the answers just don't seem right?
#1) 5x-7y=-16 10x-14y=32 5x-7(-7.90)=-16
2x-5y=11 10x+25y=-55 5x+55.3=-16
11y=-87 -55.3 -55.3 (-14.26,-7.90)
y=-7.90 5/5x = -71.3/5
x = -14.26
#2) 5x-9=7 7y-3x=-5
+9 +9 7y-3(16/5)=-5
5/5x=16/5 7y-42=-5 (16/5, 37/7)
x = 16/5 +42 +42
7/7y = 37/7
y = 37/7
#3) 9x+5y=6 2(3/11)-5y=-3
2x-5y=-3 6/11-5y=-3
11/11x = 3/11 -6/11 -6/11
x = 3/11 -5/-5y=-27/-5
y = -27/-5
#4) 8x-3y=16 (8/16,-4)
8x+3y=-8
Thanks.
Click here to see answer by Alan3354(30993)

Question 218387: Substitution method
y=-3x+13
2x+9y=-8
Click here to see answer by jim_thompson5910(28595)

Question 218401: System by graphing
2x+y=10
6x+3y=30
Click here to see answer by drj(1380)

Question 218405: Substitution method
y=-3x+13
2x+9y=-8
Click here to see answer by Fombitz(13828)

Question 218485: please help me with these 2 questions!
question 1.
write an equation in slope-intercept form
passes through(4,7) perpendicular to the line that passes through (3,6) and (3,15)
qustion 2
write an equation in slope-intercept form
passes through(1,-1) parallel to the line that passes through (4,1) & (2,-3)
Click here to see answer by checkley77(12569)

Question 218681: Consider the following equation of a line.
2x + 3y − 6 = 0
(a) Find the slope and y-intercept (if possible) of the line specified by the equation. (If an answer is undefined, enter UNDEFINED.)
m = ?
(x,y)=?

Click here to see answer by drj(1380)

Question 218678: Find the slope-intercept form of the equation of the line that passes through the given point and has the indicated slope.
Point (3,5) Slope m=3/5
y=?
Click here to see answer by drj(1380)

Question 218680: Find the slope-intercept form of the equation of the line that passes through the given points.
(2, 2)
(6, -2/3)
Click here to see answer by drj(1380)

Question 218744: Please help me solve this problem. 5y-8=3y+12, 5y-8+8=3y+12-8
8y=4
y=0.5
Click here to see answer by stanbon(57377)

Question 219018: How do you solve for y?
Questions such as:
-4x+2y=8
2y+0.5x=16
12-3y=30x
1/2x-3/4y=-2
Click here to see answer by rfer(12666)

Question 219590: from this equation 5=7x+2 how do you determine if the answer will be odd or even without solving the problem?
Click here to see answer by RAY100(1637)

Question 219652: 3x^2*4x^3*5y
Click here to see answer by checkley77(12569)

Question 220150: solve trhe following system of equations using substitution.
2x + 3y = -1
5x - 2y = -12
(__,__)

Click here to see answer by checkley77(12569)

Question 220150: solve trhe following system of equations using substitution.
2x + 3y = -1
5x - 2y = -12
(__,__)

Click here to see answer by jsmallt9(3296)

Question 220147: use the substitution method to solve the following system of linear equations.
-3x - y = 3
-3x - 5y = -21
what is the solution?
(__,__)
Click here to see answer by checkley77(12569)

Question 220269: 1.)what is the solution to the given system of equation?
y=4x+12
3x+2y+46

2.)The lines of sight to a forest fire as follow.
from ranger station A: y=3x-11
from ranger station B: 2x+3y=0
what are the coordinates of the fire, if the fire is where the lines of sight cross?
Click here to see answer by stanbon(57377)

Question 220282: How do you do problems like 2x-3y=-14 ans 3x+4y=-4 using elimination?
Click here to see answer by solver91311(16897)

Question 220282: How do you do problems like 2x-3y=-14 ans 3x+4y=-4 using elimination?
Click here to see answer by stanbon(57377)

Question 220283: solve by substitution 2x-y=4
2x-y=3
Click here to see answer by Alan3354(30993)

Question 220319: solve 3x+7y=-5 x=5-9y using the substitution method
Click here to see answer by jojo14344(1512)

Question 220379: Please help me solve this problem:
0.25x+.05(8-x)=.10(-28)
Click here to see answer by checkley77(12569)

Question 220396: solve each system of equations by using substitution
2x+y=4
3x+2y=1
my work so far was 3x+2(2x+4)=1 and then 3x+4x+8=1 and then you add the x's so 7x+8=1
Now what?

Click here to see answer by scott8148(6628)

Question 220413: Please help me solve this problem.
.25x+.5(4-x)=.10(10)
Click here to see answer by checkley77(12569)

Question 220672: Use the distributive property to remove the parentheses from the following expression 9(t-8)
Click here to see answer by babydoll77stl(4)

Question 220690: solve X square = 20
Click here to see answer by tutor_paul(490)

Question 220971: I have a jar containing 80 coins
either nickels or quarters
total value is $14.60
How many of each coin do I have
Click here to see answer by drj(1380)

Question 221064: . Given the following system of equations
x + y = 4k
2x = k
where k is a constant real number, what method would you use to solve this system and
why? Solve the system for (x, y)in terms of k . List your solution as an ordered pair.

Click here to see answer by stanbon(57377)

Question 221186: How Do I solve This?
Use the substitution method to solve the linear system given. Express
the answer as an ordered pair of the form (x,y)
x + y = 5
2x + y = 6

Click here to see answer by drj(1380)

Question 221187: Use the substitution method to solve the linear system given. Express
the answer as an ordered pair of the form (x,y)
y = x + 2
3x + 2y = 9

Click here to see answer by drj(1380)

Question 221304: adam is 5 years younger than eve. in 1 year , eve will be three times as old as adam wsa 4 years ago. find their ages now

Click here to see answer by drj(1380)

Question 221310: Solve the following system of equations using the substitution method y=x+5,
y=-9x+5
Click here to see answer by drj(1380)

Question 221310: Solve the following system of equations using the substitution method y=x+5,
y=-9x+5
Click here to see answer by sofiyac(695)

Question 221527: Can someone explain to me how to maximize by the simplex method? I get confused after the second step.
Here is the problem,
Maximize P=0.3x ++ 0.4y
Subject to: 4x + 8y equals or less than 1600
12x+8y equal or less than 1920
x equal to or greater than 0; y equal to or greater than 0
Please help me. I know how to do the first step of charting but the second step on confuses me? How do I decide which negative should be the pivot point?
Click here to see answer by stanbon(57377)

Question 221568: 4x+2y=-6
2x+3y=-3
Click here to see answer by drj(1380)

Question 221568: 4x+2y=-6
2x+3y=-3
Click here to see answer by jim_thompson5910(28595)

Question 221989: Solve by the elimination method. 7r-5s=-12 5r-7s=76
What is the solution of the system?
Click here to see answer by jim_thompson5910(28595)

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