Tutors Answer Your Questions about Systems-of-equations (FREE)
Question 28856: The Equations are:
2500x+400y=19050
1200x+500y=1900
I need to find both x and y, but it also needs to be solved using the Elimination/Combination method. Everytime I try it, I get a different answer, and some of the numbers look way out of range when I do it.
Click here to see answer by checkley71(8403)  |
Question 29616: I am not even sure I am asking this in the right section, but you guys have been great can you help me with this problem and show how you did it. We are covering "interpolation" Thanks so much I dont know what I would do without this site.
here is the table I have been given
age Monthly life insurance premium per $20,000 coverage
20 4.00
30 6.32
40 8.64
50 10.96
60 13.28
how old is the person if their premium for $20,000 in coverage is $6.90
Click here to see answer by checkley71(8403) |
Question 30852: Need your help! I am a parent of a 9th grade student who is having a problem with his algebra homework. He is working on "Sysytems of Equations", if you could please give my son some help with the following word problem, this may then help with the rest of his homework.
The difference between two numbers is 16. Three times the larger number is seven times the smaller number. What are the numbers?
Click here to see answer by acerX(62) |
Question 30859: Hello, I am not good at intermediate algebra. In fact I do not understand anything and I feel about yay tall. I feel very small. Anyways here is the questions 1. Solve the system of equations using the subtraction method...3x+y=2 and 2x-y=3. 2. Solve the system of equations using the addition (elimination) method.....9x-2y=2 and 3x+5y=5 and the next is ...Solve the equations using the addition (elimination) method... 3x-11y=9 and -9x+33y=18. My online algebra instructor is from greece and I do not understand her at all and she is horrible at spelling and she will not let us take notes what-so-ever.
Click here to see answer by Nate(3500) |
Question 31287: I am an old student back in college taking Beginning algebra. We are doing systems of equations and inequalities. Two questions involving solving eq. by addition. 4(x+1)=17-3(y-1),2(x+2)+3(y-1)=9
Second question:3x-16=5y,33-5y=4x both are systems.
Thank you,Liz
Click here to see answer by mukhopadhyay(490) |
Question 31320: This one is tough, 4x=3(4-y),3y=4(2-x)
I rewrote the equations to be:4x+3y=12 & 4x-3y= -8 both are systems. The chapter is solving systems of equations by addition.
So I mulitplied 4(3)+3(3)=12(3) to get 12x+9y=36
Next eq. 4(3)-3(3)= -8 to get 12x-9y= -24
I tried to add and got x=0.5 and I tried to put 0.5 back into the other eq. but something seems wrong. Did I go wrong in my math? Or is this an inconsistent equation?
Thank you, Liz
Click here to see answer by Earlsdon(6294) |
Question 31324: 3x-16=5y,33-5y=4x This is solving systems of equations by addition. I rewrote them to be: 3x-5y=16,4x+5y= -33
I added then together to find x and came up with x= -17 I tried to put it back into the other equation like: 3(-17)-5(-17)=16(-17) to get -51-85y= -272 and it just doesn't look right. Did I mis-calculate?
Thanks, Liz
Click here to see answer by checkley71(8403) |
Question 31803: hi i was wondering how u do elimination using mulitplication, its in ch. 13 in the algebra 1 book on systems of equations and inequalities, please help thank you. question number one is shown below.
2x+6y=10
5x+3y=1
Click here to see answer by checkley71(8403) |
Question 32649: xy=21
y=3x-2
could you please help me with this non-linear system of equations?
I started the problem x(3x-2)=21 then I got 3x^2-2x-21=0, but I didn't know where to go from there. Question is from my homework, textbook: Stepping through college algebra one step at a time. author: Robert J Rapalje, Ed.D.
Thank you for your help.
Click here to see answer by Fermat(136)  |
Question 32929: Solve the equation.
4x-1 / x^2+5x-14 = 1/x-2 - 2/x+7
Solve the system of equations.
1.) y= -5x-2
y= -3x
2.) 3x - y = 5
-4x + y = -5
3.) 2x - y = -1
2x + z = -6
3y - z = 7
I really need help on these problems I have done these problems over and over again until I am getting frustrated with myself. I need help. I am not sure if you are supposed to plug in the -3x into the other problem in question one. I am not sure if you are supposed to just add the x and y values and then solve for y in problem 2. Are you supposed to use cramers rule for problme three. Please help me I am struggling with these problems. I need somebody to help understand the process of each problem so I will understand the problems come test time on Monday. Thanks for your time and help it is greatly appreciated.
Hilary
Click here to see answer by checkley71(8403) |
Question 32929: Solve the equation.
4x-1 / x^2+5x-14 = 1/x-2 - 2/x+7
Solve the system of equations.
1.) y= -5x-2
y= -3x
2.) 3x - y = 5
-4x + y = -5
3.) 2x - y = -1
2x + z = -6
3y - z = 7
I really need help on these problems I have done these problems over and over again until I am getting frustrated with myself. I need help. I am not sure if you are supposed to plug in the -3x into the other problem in question one. I am not sure if you are supposed to just add the x and y values and then solve for y in problem 2. Are you supposed to use cramers rule for problme three. Please help me I am struggling with these problems. I need somebody to help understand the process of each problem so I will understand the problems come test time on Monday. Thanks for your time and help it is greatly appreciated.
Hilary
Click here to see answer by stanbon(75887) |
Question 32993: Divide:
x^2 + 12x + 35/x^2 + 4x - 5 / x^2 + 3x - 28 / x-1
Find (f + g)(7) when f(x)= x + 5 and g(x)= -x^2 - 6
I tried wroking out the first problem and kept getting (x+5)/(x+5)(x+4)
Im not sure if the x+5 cancels and leaves x+4. Please help. And for the second problem im confused on what to do. Please help.
Click here to see answer by stanbon(75887) |
Question 33423: Maybe it is because the problem is so long it is overwhelming or maybe it is just going right over my head, but can someone please help me with this, it would be greatly appreciated......
The formula for calculating the amount of money returned for an initial deposit money into a bank account or CD (Certificate of Deposit) is given by A = P (1 + r/n)^nt
A is the amount of returned.
P is the principal amount initially deposited.
r is the annual interest rate (expressed as a decimal).
n is the compound period.
t is the number of years.
Suppose you deposit $10,000 for 2 years at a rate of 10%.
a) Calculate the return (A) if the bank compounds annually (n = 1).
b) Calculate the return (A) if the bank compounds quarterly (n = 4).
c) Calculate the return (A) if the bank compounds monthly (n = 12).
d) Calculate the return (A) if the bank compounds daily (n = 365).
e) What observation can you make about the increase in your return as your compounding increases more frequently?
f) If a bank compounds continuous, then the formula takes a simpler, that is
A = Pe^rt
where e is a constant and equals approximately 2.7183.
Calculate A with continuous compounding.
g) Now suppose, instead of knowing t, we know that the bank returned to us $15,000 with the bank compounding continuously. Using logarithms, find how long we left the money in the bank (find t).
h) A commonly asked question is, “How long will it take to double my money?” At 10% interest rate and continuous compounding, what is the answer?
Click here to see answer by stanbon(75887) |
Question 33377: The volume of a cylinder is given by V = πr^2h where r is the radius of the cylinder and h is the height of the cylinder. Suppose the volume of the can is 100 cubic centimeters.
a) Write h as a function of r.
b) What is the measurement of the height if the radius of the cylinder is 2 centimeters?
c) Graph this function.
Click here to see answer by stanbon(75887) |
Question 33379: An open-top box is to be constructed from a 6 by 8 foot rectangular cardboard by cutting out equal squares at each corner and the folding up the flaps. Let x denote the length of each side of the square to be cut out.
a)Find the function V that represents the volume of the box in terms of x.
b)Graph this function.
c)Using the graph, what is the value of x that will produce the maximum volume?
Click here to see answer by mukhopadhyay(490) |
Question 33375: I need to find the coordinates and graph, can someone please help?……. For a fixed rate, a fixed principal amount, and a fixed compounding cycle, the return is an exponential function of time.
Using the formula, A= P(1+ r/n)^ nt, let r = 10%, P = 1, and n =1 and give the coordinates (t, A) for the points where t = 0, 1, 2, 3, 4.
Click here to see answer by algebrapro18(249) |
Question 33798: This is a systems of equations problem and I need to solve for x,y,z. I do not how to get any of the variables or what steps to take to get the answers.
The problem:
2x-5y+ ___=-22
__+y+3z=10
x+___+8z=15
The underscores represents blanks or O
If this had to be an augmented matrix, how would I do that and get those variables?
Click here to see answer by venugopalramana(3286) |
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