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

Tutors Answer Your Questions about Linear Algebra (FREE)

Question 511540: answer for -1/4(x-12)+1/2(x+2)=x+4
Click here to see answer by oberobic(2304)

Question 512021: if 5 burritos and 3 tacos cost $20.25 and 2 burritos and 4 tqacos cost $13, how much does it cost for each burrito and each taco?
Click here to see answer by oberobic(2304)

Question 512062: 1/2x^3+1
Click here to see answer by Alan3354(30983)

Question 512110: 1a.Stella is having a race with Tess. Stella gives Tess a 5o foot head start. Stella runs at 14.3 feet per second and Tess runs at 12.5 feet per second.
b.Write a system of equations for the two sisters distances.
c. How lon should the race be in order for it to be a close call.

I think b is
stella 14.3x - 50=y
and I am guessing
Tess is 12.5x=y
Please help!!
Click here to see answer by stanbon(57246)

Question 512112: 1a.Stella is having a race with Tess. Stella gives Tess a 5o foot head start. Stella runs at 14.3 feet per second and Tess runs at 12.5 feet per second. .Write a system of equations for the two sisters distances.
b.How far will they be from the start when Stella catches Tess?
c. How lon should the race be in order for it to be a close call.

I think part a is stella 14.3x - 50=y
and I am guessing
Tess is 12.5x=y
Please help!!
Click here to see answer by josmiceli(9661)

Question 512976: 2y-6x=8
4y=8y+4
Click here to see answer by Alan3354(30983)

Question 514025: you are stenciling wooden boxes to sell at a fair.It takes you 2 hours to stencil a small box and 3 hours to stencil a large box. You make a profit of $10 for a small box and $20 for a large box. If you have no more than 30 hours available to stencil and want at least 12 boxes to sell, how many of each size box should you stencil to maximize your profit
Click here to see answer by solver91311(16868)

Question 515166: I am having trouble with elimination, is it possible you could explain it to me through this problem
Solve Each system by elimination
-3x+2y-5z=-3
3x-y+3z=4
3x+5y-8z=6
Answers:
one third,9,4
two third, 7,3
3,-7,-4
no solutions
Click here to see answer by scott8148(6628)

Question 515377: y=mx+b for m
Click here to see answer by Maths68(1474)

Question 515376: P=4s for s
Click here to see answer by rfer(12647)

Question 515511: explain to me please how to graph

Click here to see answer by stanbon(57246)

Question 515511: explain to me please how to graph

Click here to see answer by oberobic(2304)

Question 515747: Saidhari bought a toaster oven for 90 dollars. this price was 1/4 off the list price. what was the list price.
Click here to see answer by Maths68(1474)

Question 516282: Find two numbers whose difference is 5 and the difference of their squares is 65
Click here to see answer by gc2000(22)

Question 516324: The solution to the following system is (-1,3). Find A and B.
Ax-2y=4
5x+By=-1
Click here to see answer by Alan3354(30983)

Question 516324: The solution to the following system is (-1,3). Find A and B.
Ax-2y=4
5x+By=-1
Click here to see answer by stanbon(57246)

Question 516904: The tens digit is 6 less than the units digit of a two digit number. When the digits are reversed the sum of the two numbers is 132. What is the original number?
Click here to see answer by mananth(12270)

Question 519008: Find the equation of the line using the given information and in the requested form.
1.Perpendicular to 7x-2y=-2 and passing through the point (7,1); in slope-intercept form.
2.Parallel to 3y-4x=3 and passing through the point (0,5); in slope-intercept form.

Click here to see answer by Maths68(1474)

Question 519115: how do you graph the equation of y = |x| translated 4 units up.
Click here to see answer by solver91311(16868)

Question 519377: how do you write y=x^2-18x in vertex form?
Click here to see answer by scott8148(6628)

Question 519603: I need some help with Linear Systems as word problems. I know how to do the work, I just need help setting up the equation for the problem.
- Rod has 40 coins, all dimes and quarters, worth $7.60. How many dimes and how many quarters does he have?
I use 'd' for dimes and 'q' for quarters.
For my first equation I got d+q=40. I don't know what the second equation is though.
Click here to see answer by Earlsdon(6287)

Question 520397: Solving a system of 3 equations by elimination. 5x+2y=4 3x+4y+2z=6 7x+3y+4z=29
I took 3x=4y+2z and multiplied it by 7 getting 21x+28y+14z=42 then did 7x+3y+4z=29 and multiplied by 3 to get 21x+9y+12z=87 but i don't know what to do next.
Click here to see answer by bucky(2189)

Question 520780: find the equation of the line with slope 3 containing the point (2,-5) in both point-slope form and slope-intercept form.
Click here to see answer by MathLover1(6622)

Question 521216: 20+4y=2x+40
Click here to see answer by oberobic(2304)

Question 522372: I'm currently working on Lesson 5-6 Sums and Differences of Rational Expressions. It's relatively easy, I'm not having too much of a problem with it. Here's the problem:
17. a/bc + b/ac + c/ab
the answer is a^2 + b^2 + c^2 over abc.
i'm confused how they got that. I can almost unerstand. One of those tip of the tongue kind of things. Please help!
Click here to see answer by scott8148(6628)

Question 522470: You have 28 coins that are all nickles and dimes. The value of the coins together is $2.05. Write and solve a system of equations that will indicate how many of each coin you have.
Click here to see answer by oberobic(2304)

Question 522936: 3x+6y=33
-8x+y=65

Solve by substiution- algebra
Click here to see answer by mananth(12270)

Question 523263: find the point of intersection of the two equations.y=2x-7,y=-3x+3

Click here to see answer by Alan3354(30983)

Question 523616: hi..I have a problem that says x=-3, y=9..What do I do?
Click here to see answer by oberobic(2304)

Question 523618: Solve graphically: 3y = 5 - x and 2x = y + 3. Write down the co-ordinates of the point of intersection of the two lines
Click here to see answer by oberobic(2304)

Question 523635: " what is the slope of "
"i have never understood this so please explain thank you."

Click here to see answer by stanbon(57246)

Question 523633: can you simplify this for me, step by step?:
i have tried using the algebraic identities.

is this correct? I have learned this before but i totally forgot it.
Click here to see answer by Alan3354(30983)

Question 523615: hi..I have a problem that says e=-3, y=9..What do I do?
Click here to see answer by richard1234(5390)

Question 523912: Find the value of X, Y, and Z
Click here to see answer by Alan3354(30983)

Question 524025: on the first day of ticket sales the school sold 5 adult tickets and 7 child tickets for a total of $154. the school took in $146 on the second day by selling 7 adult tickets and four child tickets. Find the price of an adult ticket and the price of a child ticket
Click here to see answer by mananth(12270)

Question 524098: Using y=f(x)
Translate 2 units left, 7 units down

Click here to see answer by stanbon(57246)

Question 524390: could some on plz help. Find the last three terms of (2x+y)^5
Click here to see answer by stanbon(57246)

Question 524390: could some on plz help. Find the last three terms of (2x+y)^5
Click here to see answer by solver91311(16868)

Question 524858: A plane traveled 1089 miles to Houston and back. The trp there was with the wind. It took 9 hours.The trip back was into the wind. The trip back took 11 hours. What is the speed of the plane in still air? what is the speed of the wind?
Click here to see answer by mananth(12270)

Question 526173: x+y=10
x-y=2
2. The sum of two numbers is 54, and their difference is nine more than the smaller number. What are the two numbers?
. x+y=54 x-y=x-9
. x+y=54 y-x=x+9
. 2x=54 54=xt9
. 2y=54 54=x-9
Click here to see answer by mananth(12270)

Question 526302: Hello, can you please help me with the solution to the equation X^2 + X + 2 = 0
Many thanks in advance
Costas
Click here to see answer by Alan3354(30983)

Question 526423: How do I simplify this problem: -2b(5a-5b)+4(-3ab-4b^2)
I totally do not understand this!
Thank you!!
Lisa
Click here to see answer by algebrahouse.com(1079)

Question 526421: How do I simplify this problem: 5(3x+7)
Click here to see answer by Maths68(1474)

Question 526486: Evaluate: x^2-5x+3 for x=-5
Click here to see answer by nerdybill(6950)

Question 527170: 2(x-5)*2-8=6
Click here to see answer by oberobic(2304)

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