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

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Question 65601: Solve
x + y + z = 11
2x + y - z = 13
x = 2y
Click here to see answer by praseenakos@yahoo.com(507)

Question 65631: Write the equation of the line L satisfying the given geometric conditions.
(36) L has y-intercept (0, -3) and is parallel to the line with equation
y = 2/3x + 1.
(40) L has y-intercept (0,2) and is perpendicular to the line with equation 2x-3y = 6.

Click here to see answer by venugopalramana(3286)

Question 65600: Solve
1/4x - 1/5y = 2
0.03x - 0.4y = -1.64

Click here to see answer by ptaylor(2198)

Question 64291: Could someone help me?
1.)Solve the system of linear equations by using matrices: [9,3,4] [x1] [7
[ 4,3,4] [x2] = [8
[1,1,1] [x3] [3
2. If logk4=2/3 then what does k = ?

Click here to see answer by venugopalramana(3286)

Question 65589: Please help to solve
1/5x - 5/2y = -48
0.4x + 0.05y = 5
thank you!
Click here to see answer by funmath(2933)

Question 65644: Solve each of the following systems by using either addition or substitution. If a unique solution does not exist, state whether the system is dependent or inconsistent.
10x +2y = 7
Y = -5x + 3

Click here to see answer by funmath(2933)

Question 65669: What is the linear equation that created the following input/output table:
x= -3,-2,-1,0,1, 2, 3
y=-11,-6,-1,4,9,14,19
Click here to see answer by stanbon(75887)

Question 65805: Solve
x^2 + y^2 = 25
x - y = 1
Click here to see answer by uma(370)

Question 65799: solve
2x - 3y - 3z = 2
x + 5y + 2z = -3
x + 2y = 0
thank you
Click here to see answer by ankor@dixie-net.com(22740)

Question 65852: i need step by step help on how to plot solve & plot these equations. im struggling because i dont get the steps that my teacher is giving me. if you could give me an example problem and help me go throught it step by step i would be soo thankful!!
thanks again!

Click here to see answer by checkley71(8403)

Question 65845: Solve
x + y + z = 5
x - 2y + z = 8
3x - y - z = 3
Click here to see answer by ptaylor(2198)

Question 65845: Solve
x + y + z = 5
x - 2y + z = 8
3x - y - z = 3
Click here to see answer by ankor@dixie-net.com(22740)

Question 65887: Find an equation of the line containing the points (4,9) and (-1,8)
Click here to see answer by Edwin McCravy(20055)

Question 65901: An elevator has a capacity of 500 kg. Suppose an average child weighs 34 kg and an average adult weighs 75 kg. Find the combinations of adults and children that would exceed the weight limit of this elevator by no more than 50 kg.
THANK YOU!!!!!!!
Click here to see answer by checkley71(8403)

Question 65902: The total length (l) of a certain species of snake is related linearly to the tail length (t) of this snake. Here are the measurements for two snakes of this species. Snake 1:l=150 mm and t=19 mm; snake 2:l=300 mm and t=40 mm. Use the ordered pairs (l, t).
a. Find the linear equation for these data points.
b. Use this linear equation to estimate the tail length of a snake with a total length of 200 mm.
c. Use this linear equation to estimate the tail length of a snake with a total length of 350 mm.
THANK YOU!!!
Click here to see answer by stanbon(75887)

Question 65906: How do I tell if an equation is in standard form or not? I know the standard form Ax+By=C but can you help explain this to me. Here are a couple of examples in my homework.
7y+2x=18
x+y=-8
-x+3y=-8
You do not have to answer these problems, just help me with the understanding so that I may be able to do them. I have about 15 of these and all I have to answer is if they are in standard form or not.
Thank you for any help that you may have
Click here to see answer by stanbon(75887)

Question 66017: I need some information on the history of linear equations. Such as where it orginated, who proposed the idea and anyhting along that line.
Thank you.
Click here to see answer by stanbon(75887)

Question 66137: Write the equation of the line L satisfying the given geometric conditions.
L has y-intercepts (0, -3) and is parallel to the line with equation y = 2/3x + 1. Please explain and show me how to do this. I am confused. Thanks.
Click here to see answer by stanbon(75887)

Question 66136: Write the equation of the line passing through each of the given pairs of points. Write your result in slope-intercept form, where possible.
(2, -3) and (2, 4)
Please show me how to solve this equation and write the result. I have no idea where to begin. Any help would be greatful.
Click here to see answer by stanbon(75887)

Question 66134: Write an equation of the line passing through each of the given pairs of points. Write your results in slope-intercept form, where possible.
(-1, 3) and (4, -2)
How do I go about solving these types of equations? Any help is appreciated, just show me how you did it so I can understand it better along with explanations. Thanks.
Click here to see answer by Nate(3500)

Question 66133: Write the equation of the line passing through each of the given points with the indicated slope. Give your results in slope-intercept form, where possible.
How do I solve this problem? (0, 5), m = - 3/5
Thanks for any help you can offer with the solution to this problem. Please show me how to do this so I can understand. Thanks.
Click here to see answer by Nate(3500)

Question 66091: Given the following systems of equations, which statement is true?
y=3x-8
5x+y=19
Choices:
A) 3x-8=5x+19
B) 3x-8=19-5x
C) 5x-19=3x-8
D) 5x+3x=11
Click here to see answer by pwac(253)

Question 66132: 3x-4y=-9
-x-4y=-13
Click here to see answer by ptaylor(2198)

Question 66112: hey i have another problem for you to help me out with if you could?
F street has an equation of y=x+4. Determine the x-intercept and y-intercept of f street.
thanks ALOT!
Click here to see answer by 303795(602)

Question 66145: How would you find the equation of a line if you were given the slope and the x-intercept?
This is a challenge question for our class for discussion. I am not sure how to answer this because I have dealt with the y-intercepts but not the x-intercepts. Could you give me an description on how to find the equation of a line. Thanks.
Click here to see answer by josmiceli(19441)

Question 66144: Write the equation of the line L satisfying the given geometric conditions.
L has y-intercept (0, 2) and is perpendicular to the line with equation 2x - 3y = 6.
This one has me a little confussed. Can anyone show me how to do this? Any help would be greatful. Thanks.
Click here to see answer by josmiceli(19441)

Question 66147: ok im sorry about all this but to get to the answer to my question i have to tell you other questions

C street has an x-intercept of -8 and a slope of 2. use the x-intercept point to write the equation of c street in point slope form.
Answer: y-0=2(x=8)

D street crosses c street at the point (-10,-4) and is perpendicular to the y-axis. Determine the y-intercept point and write the equation of d street.
and im not sure of the answer for this one

but this is the question i need help with

G street crosses f street at the point (3,7) and is parallel to d street. Determine the y-intercept point of g street and write the equation of g street.

thanks alot!

Click here to see answer by funmath(2933)

Question 66146: Please help with this problem that is through a practice CD class. I know that it's probably not as hard as I'm making it.
Solve for X and Y in the following problems and show your work:
a. X + Y = 6; 2X + Y = 8
b. 7X + 3Y = 14; 5X + 9Y = 10
c. 4X + Y = 16; 2X + 3Y = 24
d. 12X + Y = 25; 8X - 2Y = 14
I appreciate your help.
Click here to see answer by checkley71(8403)

Question 66228: Please help to solve
x^2 + y^2 = 36
2x^2 - y^2 = -9
Click here to see answer by checkley71(8403)

Question 66298: 1. 2x=y-1
y=3x
2. x=-y
2x+y=-2
3. 2x+2y=4
x=10-3y
4. y=7-x
2x+3y=-1

Solve by substitution. Check your answers.
I am new to Algebra 1 having trouble solving these problems.
Can you help!!!! Thanks
ISBN: 0-03-070039-6 pg 756 1-4 plus #6 ch 7.2
Click here to see answer by checkley71(8403)

Question 66336: PLease help to solve
3/5x - 1/4y = 7
0.08x + 0.05y = 1.6
Click here to see answer by stanbon(75887)

Question 66336: PLease help to solve
3/5x - 1/4y = 7
0.08x + 0.05y = 1.6
Click here to see answer by checkley71(8403)

Question 66341: This is also supposed to be solved using the substitution method.
r/2 + s/3 = 1
r/4 + 2s/3 = -1
Click here to see answer by ankor@dixie-net.com(22740)

Question 66340: This is supposed to be solved by using the sustitution method.
2a-b=1
a=3/5b

Click here to see answer by Gen(11)

Question 66360: Write an equation of the line that passess through the given points. (2,12), (7,2)
Click here to see answer by checkley71(8403)

Question 66386: How would you graph y=-1
How would you graph x=4
Click here to see answer by stanbon(75887)

Question 66335: PLease help to solve
x + 2y + z = 7
3x - y + z = -12
4x + 3y - 2z = 9
Click here to see answer by venugopalramana(3286)

Question 66325: PLease help to solve
2x - y - z = -5
-2x + 2y - z = 5
x + 3y + z =6
Click here to see answer by venugopalramana(3286)

Question 66229: please help to solve
2x - y - z = -5
-2x + 2y - z = 5
x + 3y + z = 6
Click here to see answer by venugopalramana(3286)

Question 66425: two vertices of an octagon lie at (2, -2) and (11,10).
find the perimeter of the octagon.
Click here to see answer by uma(370)

Question 66514: I am trying to find out if 3 x + 6 =10 is an Ecpression, Linear equation, or Equation which is not a linear. ( I'm confused)
Click here to see answer by stanbon(75887)

Question 66579: Complete the ordered pair for the equation 2x + y = 10. (5, ), ( , 10), ( , -2), (0, ).
I would be greatful for any help provided. Thanks
Click here to see answer by stanbon(75887)

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