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

Tutors Answer Your Questions about Linear Algebra (FREE)

Question 365853: 5x+5<40
{xlx__ ___}
Click here to see answer by rfer(12662)

Question 365869: 0.3x+1≤0.7x-4
{xlx __ __}
Click here to see answer by stanbon(57377)

Question 366344: Hello,
I need help with solving these inequality problems please.
100 > -5/3x + 6 > 0
4(x+3)-2>1(+2)

Click here to see answer by rfer(12662)

Question 366518: 4x+5y< or equal to 20

Click here to see answer by ewatrrr(10682)

Question 366386: Maximize P=-21x+11y for the constraints
x is greater than or equal to zero
y is greater than or equal to zero
y is greater than or equal to 4x-4
y is less than or equal to x+5
Click here to see answer by Fombitz(13828)

Question 366896: 6x-3=8x-9 , x=?
Click here to see answer by Jk22(389)

Question 367035: Hello,
Please help me solve this problem, thank you in advance.
3x + 7 < 4 with x =-.5
Click here to see answer by Theo(3464)

Question 367435: do you know the answer to 6x(-1)
Click here to see answer by rfer(12662)

Question 367490: Hello,
Could someone please help me with understanding this problem please, thanks in advance.
1.You are planning to spend no less than $6,000 and no more than $10,000 on your landscaping project.
a)Write an inequality that demonstrates how much money you will be willing to spend on the project.
b)Suppose you want to cover the backyard with decorative rock and plant some trees as the first phase of the project. You need 30 tons of rock to cover the area. If each ton cost $60 and each tree is $84, what is the maximum number of trees you can buy with a budget for rock and trees of $2,500? Write an inequality that illustrates the problem and solve. Express your answer as an inequality and explain how you arrived at your answer.
c)Would 5 trees be a solution to the inequality in part b? Justify your answer.

Click here to see answer by stanbon(57377)

Question 367660: Goodmorning I need help solving this system of linear equation. please include steps through out.thankyou
2x + 5y = 4
3x + 2y = 17
Click here to see answer by amoresroy(333)

Question 367686: Use the rational root theorem and the factor theorem to help solve the following equation: x^3 + x^2 - 25x -25=0. The answer I got was x= 5,-5,1...but I guessed...any help would be most appreciated.
Click here to see answer by stanbon(57377)

Question 367679: Good morning...tried to solve this and the answer I got was: x= 49+(-)i square root 90239...all over 12. The question was to use the rational root theorem and the factor theorem to solve the following equation: 6x^4 - 49x^3 +6x^2 +16x=0......Thank you in advance

Click here to see answer by Alan3354(30993)

Question 367946: I would appreciate your help on this problem.
How do I solve this system of equations
x+y=6
2x+y=8
Thank you for your time.
Click here to see answer by Fombitz(13828)

Question 367944: x - 14 = -y
x - y = 2
Click here to see answer by Fombitz(13828)

Question 368368: Can someone please show me step by step on this please...I did it but I am off 1 number..I appreciate the time.
Use matrix form and Gaussian elimination method to solve the linear system
4x+8y-4z=4
3x+8y+5z= -11
-2x+y+12z= -17

Click here to see answer by Fombitz(13828)

Question 368405: graph the linear function by finding x and y intercepts -x+2y=6
Click here to see answer by ewatrrr(10682)

Question 368541: Hello,
Can someone please help me to solve this equation to create an equation table using x, y,(x,y).
y=-1/2x-4 (the "/" symbol represents 1 over 2)

Click here to see answer by Fombitz(13828)

Question 368538: solve f(g(x)) when f(x)= 3/(x-8) and g(x)= 5/(2x)
Click here to see answer by Fombitz(13828)

Question 368956: (x + 6) divided by the fraction x^2 + 5x - 6 / x^2 + 7x - 8 please find the quotient

Click here to see answer by stanbon(57377)

Question 369229: What is the equation/function for if you enter 3 and the answer is 8 and you enter 10 and the answer is 29 and then you enter 20 and the answer is 59? How do I figure out the equation?
Click here to see answer by acalgebra(30)

Question 369372: Hi,
is the following set are bases for R^3?
a) S= {[1,2,0],[0,1,-1]}
need help asap if possible
thanks
Click here to see answer by robertb(4012)

Question 369752: I need help on simplifying monomials, a^2n^6/an^5?
Click here to see answer by stanbon(57377)

Question 370092: Find an nth-degree polynomial function with real coefficients satisfying the given conditions. n=4; i and 4i are zeros;f(-1)=68
Click here to see answer by Fombitz(13828)

Question 370217: How do i solve 7x + 2y = -8
8y = 4x
Click here to see answer by ichudov(499)

Question 370360: I don't know how to solve for t here:
t^3 - 12 t^2 - 45 t + 56
Wolfram Alpha says t=1. It's so obvious, yet how did it get that answer? It doesn't show any steps. This is the question I couldn't get on my final exam. I tried typing it into the equation solver here but it didn't work...
Thanks for your help!
Click here to see answer by Alan3354(30993)

Question 370900: Hello,
Could someone help me solve this problem? Thanks in advance.
From a base elevation of 9900ft.a mountain peak in Colorado rises to a summit elevation of 14,498ft. over a horizontal distance of 15,839ft. find the grade of the peak.
Also round to the nearest tenth please
Click here to see answer by rfer(12662)

Question 370895: Hello,
Could someone help me solve this problem please?
Thanks in advance.
6y-10<5y-8 what is the solution to this problem ?
Click here to see answer by ankor@dixie-net.com(15657)

Question 371053: Given T(x,y,z,t):(t,z,x+3y,x+y). It T a ONTO transformation?

Click here to see answer by robertb(4012)

Question 371003: i need help with linear programming and determining the maximum and minimums of an unbound function. particularly, given the constraints, i am having a hard time figuring out the points which i will then plug into the given function to determine the max. and min. i understand how to solve bound functions.
Click here to see answer by Fombitz(13828)

Question 371030: solve by elimination
a+b+c=-3
3b-c=4
2a-b-2c=-5

Click here to see answer by Fombitz(13828)

Question 372192: hi, im doing linear functions so, what is f(x)=2x to the third power or cubes, please help me!!!!
Click here to see answer by solver91311(16897)

Question 372339: Hello,
Please help me solve this problem, thanks in advance.
xy=1
x+y=2
Click here to see answer by mananth(12270)

Question 372339: Hello,
Please help me solve this problem, thanks in advance.
xy=1
x+y=2
Click here to see answer by neatmath(300)

Question 372393: Hello,
Please help solve this problem,thank you.
xy = 3
x + y = 4

Click here to see answer by Fombitz(13828)

Question 372421: Let T(x,y,z) = (y,z,0). Prove that T^3 must be a zero transformation (T^3=ToToT)
Click here to see answer by user_dude2008(1861)

Question 372520: find g'(x) for g (x) = x-6/5
Click here to see answer by Fombitz(13828)

Question 373530: Hello,
Can someone help me solve this problem, thanks in advance.

An example of a real-life situation that could be modeled by a function is the family wants to go to a local theme park. Tickets are $25 and parking is $10. Example below is the total price for a family is given by where a is the number of people in the family.
P=25a+10 there are 20 family members
Click here to see answer by dianitaa_328(8)

Question 373535: Hello,
I need help solving this problem, thanks in advance.
f(x) = $35.99 * 7 days

Click here to see answer by rfer(12662)

Question 373594: find two numbers whose sum is 0 and whose difference is 6
Click here to see answer by Jk22(389)

Question 373905: Hello,
Can anyone explain why vertical lines fail the "vertical line" test in an easy explanation?
Thanks
Click here to see answer by Fombitz(13828)

Question 374048: Hello,
Can someone help me solve the following problem?
H(x) = 2.75x + 71.48
Click here to see answer by jim_thompson5910(28595)

Question 374092: Hello can someone help me solve this problem please, thanks.
solve f(x) = 1 + 19x * x
x = -2
Click here to see answer by jim_thompson5910(28595)

Question 375020: How can I solve the system of equations
x^2+y^2=100
3x-y=10
Click here to see answer by Fombitz(13828)

Question 375308: can you show me a step by step approach to this f(a+h) - f(a) divided by h. for f(x)=x^2-7. Thank you.
Click here to see answer by robertb(4012)

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