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

Tutors Answer Your Questions about Linear Algebra (FREE)

Question 571103: 7x-6y=7, for y
Click here to see answer by Maths68(1140)

Question 569725: -6+3/5x=15
Click here to see answer by stanbon(48507)

Question 569324: I get 2 points for every basket I make. How many points for n baskets?
Click here to see answer by solver91311(12117)

Question 569143: How to find the lowest approval rating and when it was with the following formula
A=2.5x^2-9.5x+48
Thank you!!! :-)
Click here to see answer by htmentor(580)

Question 568311: Solve the system of equations by graphing
-3x-2y=6
3x-y=12
Click here to see answer by mananth(10539)

Question 566516: How do I use linear combinations to solve this linear system: y=x-9
x+8y=0
So far I've gotten this far:
(y-x=-9) 9y=-9 (Divided 9 to each side)
8y+x=o y=-1
I need the other half of the problem where y is eliminated and x is solved so I have two points. Example: (8,-1) This is the solution I just don't know how to get 8. Please help me out, thank you.
Click here to see answer by mananth(10539)

Question 566535: The sum of two numbers is 30. The larger number is 5 more than four times the smaller one. Find the product of the number. (Ans 125)
Click here to see answer by ankor@dixie-net.com(12683)

Question 566540: The ratio of two numbers is 4:3 if 4 is subtracted from the larger and 8 is added to the smaller number. They become equal. Find the numbers (Ans. 48 and 36)
Click here to see answer by mananth(10539)

Question 566538: The difference of two numbers is 4. Larger number exceeds three times the smaller number by 2. Fidn the numbers (Ans. 5 & 1)
Click here to see answer by solver91311(12117)

Question 566202: Perform the indicated operation
7. (4-2i)(8+4i)
Simplify and write in a+bi form
10.i^38
Divide
13. 8+4i/7+3i
Click here to see answer by lwsshak3(2907)

Question 565506: write the equation of the line which passes through (5,-2) and is parallel to x=4
Click here to see answer by josmiceli(6769)

Question 563828: The thrust of an airplane's engines produces a speed of 371 mph in still air. The wind velocity is given by (21,-35). In what direction should the airplane head to fly due south? Give your answer as an angle from due south rounded to three significant digits.
Click here to see answer by Alan3354(21550)

Question 563769: A paperboy is riding at 9 ft/s on a bicycle and tosses a paper over his left shoulder at 25 ft/s. If the porch is 44 ft off the road, how far up the street should the paperboy release the paper to hit the porch?
Click here to see answer by lwsshak3(2907)

Question 563136: Hi --
I'm a beginning student in Linear Algebra, and am not quite sure how to answer the following question, which is taken from my textbook:
"Suppose the system below is consistent for all possible values of f and g. What can you say about the coefficients c and d. Justify your answer.
2x + 4y = f
cx + dy = g."
Not quite sure what is meant by the question "what can you say." My only thought so far is that If the system is consistent, that means x and y have the same value for both equations:
x(2 + c) + y(4 + d) = f + g, which, if c = f+g, fits into the form ax + by = c. But that's about it.
Thanks in advance!
Cheers,
Dave Yrueta
Click here to see answer by Edwin McCravy(6931)

Question 562276: During one calendar year, a state trooper issued a total of 375 citations for warnings and speeding tickets. Of these, there were 37 more warnings than speeding tickets. How many warnings and how many speeding tickets were issued? Let w= warnings and s= speeding tickets.
Click here to see answer by lwsshak3(2907)

Question 467255: QR is an arc of a circle with a center P. If the length of the arc is 6pi and the degree of the angle formed at center P is 30 degrees, what is the area of the sector PQR?
The answer is 108pi.
Please help me understand how they got this answer.
Thank you!

Click here to see answer by TutorDelphia(189)

Question 562014: A bill for $40 is paid with $5 bills and $10 bills seven notes are need in total. how many 5 dollar notes are used?
Click here to see answer by josmiceli(6769)

Question 561746: A woman can walk 2 mph faster down a trail than she can returning up the trail. It takes her 2 hours to get down and 4 hours to get back up. What is her speed down the trail?
I can't figure out how to write the equation. I think X is the speed down and X+2 is the speed up but I can't get any further.
Click here to see answer by htmentor(580)

Question 560685: y/7=(y-5)/2
This kind of problem is difficult for me. Can someone take me step by step?
Click here to see answer by jim_thompson5910(21667)

Question 559854: factor
-4x^3-36x
and factor
2x^2+8x-24
please help me!
Click here to see answer by Alan3354(21550)

Question 558769: -4x+4y=12 solve for y
Click here to see answer by kkasko(45)

Question 558149: i need to complete the table so that the functions are linear....
i have the answer but have NO IDEA how you get there! Thanks SO MUCH!!!
X Y
-3 7
-2 4
-1
0
1
2 -8
3
Click here to see answer by ankor@dixie-net.com(12683)

Question 558328: What are the domain and range of the relation {(2, 2), (4, 2), (6, 2)}? Is the relation a function? Choose yes or no.
Given f(x) = x2 – 2x, find f(4).
Click here to see answer by Edwin McCravy(6931)

Question 557754: P=2l+2w solve for w (perimeter of a rectangle)
Click here to see answer by Maths68(1140)

Question 557047: 1/3(x-7)+5=6x+4
1/3x-7/3+5=6x+4
1/3x=6x+34/3
-17/3x=34/3
-102/51
x=-2
is this correct?
Click here to see answer by Theo(2967)

Question 557049: 3[4(y+2)-(y+5)]=3(3y+1)
3[4y+8-y+5]=9y+3
3[3y+13]=9y+3
9y+39=9y+3
9y+36=9y
36=0
no solution
is this correct?
Click here to see answer by Tutor77(13)

Question 556317: Please help me solve this problem |4x-5|=|3x-23|
Click here to see answer by jim_thompson5910(21667)

Question 554500: "In this exercise, use long division to divide the first polynomial by the second.
4x+3x^2+x^3-5, x-2
I would really appreciate your help with this problem...
Click here to see answer by Alan3354(21550)

Question 554502: "In this exercise, use long division to divide the first polynomial by the second.
2x^4+3x^3->x-10, x^2-2x-5
I would really appreciate your help with this problem...
Click here to see answer by Alan3354(21550)

Question 553574: -3n+2<20
Click here to see answer by saifoo.khan(153)

Question 553574: -3n+2<20
Click here to see answer by stanbon(48507)

Question 553327: x^2= 4-y
x=y+2
Click here to see answer by mananth(10539)

Question 552839: how do you graph 5x-4y=24
thank you and reply ASAP i need it thanks
Click here to see answer by jim_thompson5910(21667)

Question 551979: how do you graph y<1/3x+1
Click here to see answer by Edwin McCravy(6931)

Question 551904: d=5h, for h
the solution is h=
Click here to see answer by jim_thompson5910(21667)

Question 550939: The line through the point (-2, 6) with
slope -5 is ?

another problem :
A line parallel to y=8x-1 is?

Another Problems :
Find the slope of the line through the
points (-8, 5) and (-23, 2).

Click here to see answer by oberobic(2302)

Question 550876: Please show me how to simplify the equation below:
x^3-2x+4x-3=0
Click here to see answer by Alan3354(21550)

Question 550317: how would i go about this?
f(x)=8-3x find f(4)
Click here to see answer by jim_thompson5910(21667)

Question 545030: wriye the equation with the line m= 5/2 and pass through (-4, 2)
Click here to see answer by mathstutor458(57)

Question 546568: Can u give me the steps in. Sentence on how to solve this equation ? 2x+4=12
Click here to see answer by mathstutor458(57)

Question 546887: could this be solved as a nonlinear function if so what's the answer?
4+2x=16

Click here to see answer by mathstutor458(57)

Question 548014: solve each system by substitution. check your answers.
1. {y=x+1
{2x+y=7
2. {x=y-2
{3x-y=6
Click here to see answer by mathstutor458(57)

Question 548365: solve :
10 34
----- = ---------
x x + 12

Click here to see answer by mathstutor458(57)

Question 548452: Solve the system by substitution
2x+9y=34
5x-9y=-41
Click here to see answer by mathstutor458(57)

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