Questions on Algebra: Linear Algebra (NOT Linear Equations) answered by real tutors!

Tutors Answer Your Questions about Linear Algebra (FREE)

Question 85632: The directions say "Is the relationship shown by the data linear? If it is, model the data with an equation."
The problem looks like this:
X Y
2 3
3 7
4 11
5 15
I have no idea what to do and no book to look to for help.
Thanks.
Click here to see answer by Earlsdon(6287)

Question 85673: write an equation for a line through the points (0,5) and (-5,5)
Click here to see answer by scianci(186)

Question 85746: i am confuse how to find the pairs of equation is in dependent or independent and incosistent the ff lines will intersect or coincide this given equation
2x-5y+3=0
4x-10y-5=0 i hope you can help me this problem..thank you so much..
Click here to see answer by scianci(186)

Question 86044: Create one statement in English representing an algebraic relationship
Click here to see answer by sofiyacherni(99)

Question 86464: solve the following system of equtions and give the general solution in parametric vector form.
x+y-2z=6
3y+z-w=3
-2x+y+2z-w=9
Click here to see answer by Edwin McCravy(8879)

Question 86588:
(1.2x10³)(3x10)
Click here to see answer by checkley75(3666)

Question 86585: 6(2x - 4) -3 [2 – (3 y + 4) ]
Click here to see answer by checkley75(3666)

Question 86582: (4x³y²)(-7x-11y-2)
Click here to see answer by checkley75(3666)

Question 86583: 6√‾3-13√‾3
Click here to see answer by tutorcecilia(2152)

Question 86584: 3√‾50x + 7√‾2x
Click here to see answer by tutorcecilia(2152)

Question 86586: 6x-9 + y
x + 2 5 fox x 1, y = 10

Click here to see answer by stanbon(57203)

Question 86576: ok how do I write an equation or inequality to show the profit a business makes in selling purses at 250 dollars for 80 purses and 45 purses at 400 dollar will I be able to graph the business potential sales. and what are the reasons why we would use a function notation
Click here to see answer by stanbon(57203)

Question 86861: f(x) = xsquared - x - 2 if f = 0,-2,1 I think i have to put the o and -2 and 1 where the x is and then do the equation but when I have a -2 and i subsitute it where their is a minus x then do I add the 2
Click here to see answer by Nate(3500)

Question 86860: ok my problem is you have $30 in change in your drawer consisting of dimes and quarters write an inequality that shows the different number of coins in your drawer. so i think if I use x as the number of dimes and y as the quarters can I write that f(y) > f(x)
Click here to see answer by scott8148(6628)

Question 87171: The solution to the system of equations

x+3y = 12
4x - y = -17 is

A. (3,3)
B. (12, -17)
C. (-3,5)
D. (5,3)
Click here to see answer by jim_thompson5910(28476)

Question 87170: The equation of the line through (8,6) and (2,-4) is

A. 5x - 3y = 22
B. Y = 3/5x = 8/5
C. 3x = 4y = 48
D. -4x + 2y = -16

Click here to see answer by jim_thompson5910(28476)

Question 87169: f(x) = (x+2)(2x-3). f(-2)=

A. 0
B. 4
C. -6
D. -14
Click here to see answer by jim_thompson5910(28476)

Question 87172: Select the point which is in the feasible region of the system of inequalities

4x + y (is less or equal to) 8
2x + 5y (is less or equal to) 18
x (is greater or equal to)0, y (is greater or equal to) 0

A. (2,4)
B. (-1,2)
C. (1,3)
D. (4,1)

Click here to see answer by stanbon(57203)

Question 87210: This is the problem:
3z/z^2-9 - 2/3-z
and this is what I've come up with...Is it correct?
5z+6/(z-3)(z+3)
Thanks!
Click here to see answer by stanbon(57203)

Question 88151: Factor completely
8x^2 -32x +24
Click here to see answer by jim_thompson5910(28476)

Question 88149: Factor this completely
3x^2 +23x -36
Click here to see answer by jim_thompson5910(28476)

Question 88150: Factor completely
7x^2 -28y^2
Click here to see answer by Flake(45)

Question 88425: These problems came from my daughter's professor. If they are from a text, we do not know the ISBN.
I am trying to help my daughter (35y.o) who is taking an Algebra course. It has been 40+ years since I have done this type of math.
The questions are:
A. Graph the function f(x)=-3x+7. Be sure to properly label the graph, which includes labeling the axes and the line with its equation.
B. Graph the function f(x)=-3x(sq) +x -5. Same rule as above.
I would appreciate any assistance. This one really confused me.
Click here to see answer by stanbon(57203)

Question 89206: For the quadratic function Q(x)=x^2+5x-36, determine the y-intercept.
Click here to see answer by Nate(3500)

Question 89207: Find the solution sets for
2x^2+3x-5=0
Click here to see answer by Nate(3500)

Question 89205: Find the solution set for
x^2-21=4x
Click here to see answer by Nate(3500)

Question 89229: Determine the value(s) of for which the following system of equations has nontrivial solutions.
(k+4)x + (k-2)y = 0
4x + (k-3)y = 0
Please explain how you get the answer so I can do the others.
Thank you,
Click here to see answer by Edwin McCravy(8879)

Question 89344: Can you help with find the solution of sets for
|3x+4|< 13
Click here to see answer by THANApHD(104)

Question 90449: help solve the following I am having great difficulty:

Click here to see answer by malakumar_kos@yahoo.com(315)

Question 90462: This problem is very complicated, please help
D = c-s/n = for s
Thanks
Click here to see answer by malakumar_kos@yahoo.com(315)

Question 90800: i need help with the following question:
rewrite the equation as a function of x
-3x+4y =11
thank you
Click here to see answer by malakumar_kos@yahoo.com(315)

Question 90800: i need help with the following question:
rewrite the equation as a function of x
-3x+4y =11
thank you
Click here to see answer by praseenakos@yahoo.com(507)

Question 90799: evalute each function for the value specified:
f(x)= x (to the second power) - 7x +10,
find (a) f(0), (b)f(5), and (c) f(-2)
thank you for your help
Click here to see answer by malakumar_kos@yahoo.com(315)

Question 90798: evalute each function for the value specified:
f(x)= x (to the second power) - 7x +10,
find (a) f(0), (b)f(5), and (c) f(-2)
thank you for your help
f(0)=10 f(5)=5^2-7*5+10=0 f(-2)=(-2)^2-7*(-2)+10=28
Click here to see answer by maths0503(3)

Question 90839: if f(x) = 5x-1 then find the following f(a-2)
i am so lost on where to begin with this, thank you for the help
Click here to see answer by Nate(3500)

Question 90840: graph the functions f(x) = -2x -5
can anyone help me with this?
thank you
Click here to see answer by jim_thompson5910(28476)

Question 90953: WORD PROBLEM - HELP PLEASE!!!!
Your company directors figure the company needs to make at least 12 heat seaking and at least 20 radar guided missiles per month to meet quota. In addition, production limits the number of missiles to no more than 72 per month. you can sell the heat seaking missiles for $312,000 and sell the radar guided missiles for $512,000. how many of each should you sell to maximize profits per month. what is the maximum profit???? OH HELP!!!!
I need the following:
constraints
objective function
graph and SOLUTION
THANKS
LLo
Click here to see answer by stanbon(57203)

Question 91005: Translate to an algebra statement. Seven times the difference of six and twice a number yields the same result as the same number decreased by one.
So far I have came with this. I am not if this is correct.
7(6-2x) = 7(6-2X)-1
Click here to see answer by psbhowmick(529)

Question 91279: Give the sum p+q where p/q is the reduced fraction represented by repeating decimal 1.36(bar over 36).
answers:
a. 13
b. 19
c. 26
d. 28

Click here to see answer by Earlsdon(6287)

Question 91951: im not sure what kinda problem this is but i cant figure out HOW to solve it in steps. Jim can fill pool carying buckets of water in 30 min.Sue can do same job in 45 min. and tony can do it in 1 and 1/2 hours.How quickly can they all do the job together?
Click here to see answer by mathispowerful(115)

Question 92012: 2x+ 3y = 6 (for x)

D = c-s over n ( for s)
Click here to see answer by funmath(2925)

Question 92559: Find an equation in standard form of the line described.
has x-intercept 4 and y-intercept -8
Ch.3

Click here to see answer by chitra(359)

Question 92921: Given r(x)=7x-22 and t(x)=x^2+3, express the sum (r+t)(x)
Click here to see answer by stanbon(57203)

Question 92935: f(x) = 3x(2x – 1). f(–1) =
Click here to see answer by psbhowmick(529)

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