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

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Question 135394: Solving Systems of Linear Equations by the Substitution Method.
I am having a difficult time understanding how to do this. I was hoping someone could help me.
The problem is: x=y-2 x+3y=2

But I am not sure where to go after that.
Will you please help me understand this? Thank you!
Click here to see answer by stanbon(75887)

Question 135572: x+3y=4
Click here to see answer by checkley77(12844)

Question 135751: How would I solve this Equation the fractions confuse me ? :

1)x/3 - 7/8 = 2/5(x + 15/4)
Click here to see answer by ptaylor(2198)

Question 135833: How do you solve this system of equations by graphing? y=-3x-2 y=x-2
Please give me an answer as soon as possible the assignment is do tomorrow 4/9/08.
Thank You for all your help Taylor
Click here to see answer by ankor@dixie-net.com(22740)

Question 135962: 2y-x=3
x=3y-5
Click here to see answer by checkley77(12844)

Question 136114: Linear functions
y=3/4x + 2, find x if y=2/3
Click here to see answer by ijeoma(3)

Question 136303: I have two sets of points; (42,20) and (52,10). I need an equation in the form of y = mx + b. The answer I got was y = 1x - 22. Is this correct?
Click here to see answer by scott8148(6628)

Question 136365: Graph the equations; calculate the slope, x-intercept, and y-intercept.
3x = -2
This is what I got so far.
3x/3 = -2/3
x = 0.667
I'm not sure how to graph this; find the slope and the x & y intercepts. Thanks!

Click here to see answer by checkley77(12844)

Question 136364: Confused, not sure how to find the solution.
Find the area of a rectangle if three of its corners are (-0.1,-3.4), (-7.9,-3.4), and (-0.1,6.8).
Thanks!
Click here to see answer by scott8148(6628)

Question 136567: How do I go about solving this? The answer is yes but I don't know why. Please help. Thank You very much:)
Determine whether the given point is in the solution set to the given system.
(-3, -1, 4)
2x-2y-3z=-16
4x-3y+3z=3
x+y-5z=-24
Click here to see answer by stanbon(75887)

Question 136706: please help me with finding the equation of the line with a slope of -1/2 that passes through (2,-4). State in slope intercept form.
Click here to see answer by scott8148(6628)

Question 136872: Two foods, I and II contain the following percentages of carbohydrates, protein, and fat:
Food Carbohydrates Protein Fat
I 40% 50% 6%
II 60% 20% 4%
Food I costs 3c. per gram, and food II costs 4c per gram. Determine the amount of each that should be served to produce at leat 10 grams of carbohydrates, 7.5 grams of protein, and 1.2 grams of fat, if cost is to be minimized.
Let x=amount of food I
Y=amount of food II
minimize z=0.03x + 0.04y, subject to 0.4x+0.6y=10
0.5x +0.2y=7.5
0.06x+0.04y=12
x=0, y=0
How should I draw this and add this formula in excel?
Click here to see answer by stanbon(75887)

Question 136893: help me solve please:
y+3x=9
i dont get how to solve/get for x & y.

Click here to see answer by stanbon(75887)

Question 136911: Please help! It looked easy to solve but I've been at it for fifty minutes and my solutions are not anywhere near (0,1). Can someone please help me? Thank You:)
Solve the system.
y=3^x
y=5^x
Thanks again!
Click here to see answer by dolly(163)

Question 137094: what is y=3/2x-5 - Please help?!?!?
Click here to see answer by checkley77(12844)

Question 137178: Could you please solve this problem by addition method?
x+y=13
22x+36y=356
Thank you.
Click here to see answer by checkley77(12844)

Question 137256: Could someone help me understand how to solve the problem posted...especially how the variable or unknown will be removed from the denominator. Any help would be greatly appreciated.
Question:
Solve the following system:
5/3a - 7 = -2/5b
7/6a - 1/10b = 3

Click here to see answer by stanbon(75887)

Question 137275: Could you please solve this system by the addition method, indicating if the system is independent, inconsistent, or dependent.
I really appreciate your help. Thank you very much.
-3x + y = 3
2x - 3y = 5
Click here to see answer by oscargut(2103)

Question 137269: Could you please solve by using sustitution method. Please show details.
Thank you.
x - y = 3
3x - 2y = 3
Click here to see answer by MORUPHOSUOLALE(24)

Question 137270: Could you please solve by using sustitution method. Please show details.
Thank you.
x - y = 3
x=3+y
Now substitute x value of 3+y into the below equation
3x - 2y = 3
3(3+y)-2y=3
9+3y-2y=3
9+y=3 subtract 9 to each side
y=3-9
y=-6
x-y=3
x=3+y
x=3+(-6)
x=-3

Click here to see answer by tns_tutor5000(9)

Question 137267: write the equation for:
on a canoe trip, Rita paddled upstream (against the current) at an average speed of 2 mi/h relative to the riverbank. On the return trip downstream (with the current), her average speed was 3 mi/h. Find Rita's paddling speed in still water and the speed of the river's current.
Click here to see answer by ankor@dixie-net.com(22740)

Question 137276: Please help and solve this system by the addition method and indicate if the problem is independent, inconsistent or dependent. Thank you.
x + 3 (y - 1) = 11
2(x - y) + 8y = 28
Thank you very much.
Click here to see answer by Fombitz(32388)

Question 137272: Could you please solve by using sustitution method. Please show details.
Thank you.
x - y = 3
3x - 2y = 3
Also please tell if it is independent, inconsistent or dependent.
Click here to see answer by Fombitz(32388)

Question 137243: can you please solve this by the substitution method?
y - 2x = -7.5
3x - 5y = 3.2
Thank you for your assistance.
Click here to see answer by ankor@dixie-net.com(22740)

Question 137356: I am finding partial decomposition very intimidating-Please help if you can:)Thank You very much!
Find the unknowns on the right side of the partial fraction decomposition.
x+3/x^3+64=A/x=4+Bx+C/x^2-4x+16
Click here to see answer by stanbon(75887)

Question 137354: Could someone please show me step-by-step how to solve this? Thank You for your help.
Solve the system.
4x^2-4y^2=20
3x^2+2y^2=35
Click here to see answer by stanbon(75887)

Question 137404: Tutor could you please assist and solve this by the substitution method?
3y = x + 5
3x - 9y = -10
I do so very much appreciate your help.
Thank you.
Click here to see answer by ptaylor(2198)

Question 137403: Tutor please help and would you please solve by substitution method.
x = 1/8y - 1
y = 1/4x + 39
I would be very grateful for your help.
Thank you
Click here to see answer by stanbon(75887)

Question 137428: 4x = 8
5y = 15
How would I solve this?
Click here to see answer by sassylilmommie(4)

Question 137893: The sum of three numbers is 16. One of the numbers is 2 more than twice a second number, amd 2 less than the third number. Find the numbers.
Click here to see answer by josmiceli(19441)

Question 137979: How do you solve this system?
x + 2y-3z = -8
2x + y + 3z= 17
x - 3y + 3z = 11
Click here to see answer by stanbon(75887)

Question 137891: 3x+2y=-2
2x-3z=1
0.4x-0.5z=-2.1

Click here to see answer by ankor@dixie-net.com(22740)

Question 138128: I have a couple of questions.They are word problems dealing with planning for a dance and keeping the ticket price low.
1. Band A charges $600 to play for the evening. Band B charges $350 plus $1.25 for each ticket sold. Write a linear equation for the cost of each band. Also find the number of tickets for which the cost of the two bands will be equal.
2. A caterer charges a fixed cost for preparing dinner plus a cost for each person served. You know that the cost for 100 people will be$750 and the cost for 150 people will be $ 1050. Find the caterer's fixed cost and the cost per person served.
3.From the information above , assume that 200 people will come to the dance. Which band would you choose and the cost per ticket that you need to charge to cover expenses?
Please, please HELP!!!
Click here to see answer by ankor@dixie-net.com(22740)

Question 138352: Solving Systems of Linear Equations by Graphing
2x-y=4
x+y=5
How do I do these equations.
I don't know how to set them up to solve, or what do with them once they are solved. My book does not explain these problems at all.
Thanks
Click here to see answer by checkley77(12844)

Question 138481: Please, ia m not even sure if i am in the right area. Wont someone help me please?????
Solve the system by the elimination method of these:
1) 5x + 5y = -11
7x - 2y = 13
2) 0.3x - 0.2y = 4
0.2x + 0.5y = 1
3) 6x - 9y = 13.5
7y - 2x = -6.5
4) 0.05x + 0.25y = 11
0.15x + 0.05y = 12
On these it says "What is the solution of the system". (Type an order pair. Type an integer or a decimal. Type N if there is no solution. Type I if there are infinitely many solutions)
Will someone, anyone, please help me. I am so confused. thank you in advance to anyone that will take the time to help.
Click here to see answer by stanbon(75887)

Question 139013: x-y-z=0
x-2y-2z=3
-2x+2y-z=3
Click here to see answer by checkley77(12844)

Question 139472: How can I solve this system?
3x+4y=29
-x+2y=7
Click here to see answer by jim_thompson5910(35256)

Question 139467: Hello, I worked this problem and only got half credit.
How can I work this as a systems of equations
x^2+y^2=25
5=x+y
This is what I did
x=5-y
(y-5)^2+y^2=25
2y-y^2-25=0
Click here to see answer by checkley75(3666)

Question 139845: The saddle height on a bicycle should be 109% of the riders inside leg measurement (L). Write and equation expressing the fact that the saddle height for Brenda is 36 inches.

Here is what I can think of...
109%/1000 = 0.109
.109+L=36 or 36/109=L
Click here to see answer by rapaljer(4671)

Question 139890: x-y=-5
x=3y=3 couldyou please help me understand how to solve this problem?
Click here to see answer by stanbon(75887)

Question 139898: Can you please help me graph this equation?
2x-3y=-6

Click here to see answer by stanbon(75887)

Question 139899: Can you please tell me if this is correct? I am not very good with these. The answer I got was -6
What is the slope of the line 12x+3y=-72
Click here to see answer by stanbon(75887)

Question 139902: I am not sure if I have this correct. I did try it though. In 1992 the average price of a lot on the beach near a town on Puget Sound was $94,000. By 1999, the average price of a home was $129,000. Find a linear model for the price of such a lot on the beach, P, if t=o represents the year 1992.
Here is my answer: P=$35,000t+$94,000
Click here to see answer by edjones(8007)

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