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

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Question 499212: Use the gauss-jordan method to solve this system of equation
4x + 4y - 4z = 24
2x - y + z = -9
x - 2y + 3z = 1
can you show me step by step how to solve this problem?
Diana
Click here to see answer by emargo19(101)

Question 499526: 6(b-x) = 4b + ax
solve for X
Click here to see answer by edjones(8007)

Question 499526: 6(b-x) = 4b + ax
solve for X
Click here to see answer by jim_thompson5910(35256)

Question 499869: I dont understand how to write an equation of the line that passes through (-2,1) and is perpindicular to y=1/2x+1.

Click here to see answer by oberobic(2304)

Question 499998: Hi, I have worked this problem over and over, but I can't seem to get it right. The directions are to solve using the elimination method. Thanks for your help!
4x-y+2z=-18
-x+2y+z=11
3x+3y-4z=44
Click here to see answer by ankor@dixie-net.com(22740)

Question 500746: Help with Linear Programming. I don't know how to solve this. If profit is represented by P=3x+4y, find the maximum profit under these constraints: y + x <= 3 ; y >= 0 ; y <= 2 Hellpppp.
Click here to see answer by solver91311(24713)

Question 501119: 1/8q=17
Click here to see answer by Alan3354(69443)

Question 501388: the problem was -10(-5a^3b^2)
i solved it out to be 5a^3(10b^2)
would the answer end uop being -50a^3b^2 or would it stay the same?
thank you in advance for your help
Click here to see answer by rfer(16322)

Question 503519: x + y = 5
Click here to see answer by xdragonfight(116)

Question 505031: y=3x+5
i have to identify the slope and y-intercept of the linear rquation ... please help
Click here to see answer by scott8148(6628)

Question 505233: two numbers are in the ratio 8:3 if the sum of the numbers is 143 .find the numbers
Click here to see answer by stanbon(75887)

Question 505893: The line y = 7x - 2 has a slope of 7 and a y-intercept of (-2 ,0).
True or False?
Click here to see answer by stanbon(75887)

Question 506269: -3(3x+15)-(10+x)=35 What is X?
Click here to see answer by xdragonfight(116)

Question 506755: What is the simplified inequality of 5x-y>1
and 7x+y<9
Click here to see answer by jennywecas(28)

Question 507093: A Local Travle AGent Service advertsied a round trip to Toronto by motor coach to see a popular stage show for $205. the same trip was available to attend a concert for $195. The tavel service sold 14 tickets to the stage show. How many tickets to the concert were sold if the totle sales were $5990.
I do not need the answer because my teacher gave it to me i just need the steps to solving it. An EQUATION. The answer is 16. I just need an equation. if this is legit Thank you. please respond with an eqaution soon
Click here to see answer by jim_thompson5910(35256)

Question 507122: Let T: R^3 to R^2 be defined by T(a,b,c)=(a+b,2a-c). Determine T^-1(1,11)
Click here to see answer by tinbar(133)

Question 507453: Suppose you are planning to invest a sum of money. Estimate the rate that you need so that your investment doubles in 10 years.
The Rate = ____%
Click here to see answer by lwsshak3(11628)

Question 507596: What is the solution of the system
-3x+2y=8
x+2y=-8
Click here to see answer by lwsshak3(11628)

Question 509684: {3/2x+9=y
{4y-6x=36
Click here to see answer by mananth(16946)

Question 510119: y=3x-2
How do you get to the slope? is this right?
-2/.6
if this is wrong, how do i get the right answer?
Click here to see answer by oberobic(2304)

Question 511245: x+4y=7 and 4x-y=3
Click here to see answer by solver91311(24713)

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(69443)

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(75887)

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(19441)

Question 512976: 2y-6x=8
4y=8y+4
Click here to see answer by Alan3354(69443)

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(24713)

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(16322)

Question 515511: explain to me please how to graph

Click here to see answer by stanbon(75887)

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(69443)

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(75887)

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(16946)

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(24713)

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(6294)

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(20849)

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

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