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

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Question 176635: Solve the following systems using inverse matrices. can you also show me the steps.. thanks

2x - y = 2
2x - 2y = 4

2x + 3y + 4z = 3
-13x + 5y - 2z = 3
-3x + 4y + 3z = 6

Click here to see answer by Mathtut(3670)

Question 176633: Which point gives the minimum value for P = 3x + 2y and lies within
the system of restrictions?

( < all of them are equal or greater than but i just dont kno how to do that on here)
1 < x < 6
2 < y < 5
x + y < 10

A. (1, 2) B. (0, 0) C. (5, 5) D. (1, 5)
Click here to see answer by Fombitz(2113)

Question 176832: Which point gives the minimum value for P = 3x + 2y and lies within
the system of restrictions?

A. (1, 2) B. (0, 0) C. (5, 5) D. (1, 5)
1 < x < 6
2 < y < 5
x + y < 10
Click here to see answer by solver91311(5072)

Question 177027: (x/4)/2-(1/4)=(6x-1)/20 The answer I keep getting is 28 but when I put 28 in to check the problem it doesn't equal. Thanks for the help.
Click here to see answer by stanbon(26259)

Question 177520: the answer to the substition method of 2x+3y=5
x=4=2y
Click here to see answer by Alan3354(6059)

Question 177683: List ALL of the following ordered pairs (points) that are solutions of the equation 5X-2Y=10,
(0,5) (1,-2.5) (2,8) (3,2.5)

Click here to see answer by solver91311(5072)

Question 177734This question is from textbook Algebra and triganometry
: solve the equation for the indicated variable.
a-2[b-3(c-x)]=6; for xThis question is from textbook Algebra and triganometry

Click here to see answer by Mathtut(3670)

Question 177850: Find the additive inverse of each number. (please)

15. -2 - 3i
16. 1 + 4i
17. 5 - 3i
18. -7 + 2i
Click here to see answer by Mathtut(3670)

Question 177855: Solve by completing the square. Show your work.

29. 2x2 - 6x + 1 = 0
30. -x2 - 8x + 5 = 0
31. 9x2 - 18x - 1 = 0
32. -4x2 + 8x - 3 = 0
Click here to see answer by edjones(3291)

Question 177858: Evaluate the discriminant of each equation. How many real and imaginary
solutions does each have?
37. x2 + 5x + 6 = 0
38. 3x2 - 4x + 3 = 0
39. -2x2 - 5x + 4 = 0
40. 16x2 - 8x + 1 = 0
Click here to see answer by solver91311(5072)

Question 177851: Find the absolute value of each complex number.

19. 7i
20. 12
21. -3 - 2i
22. Writing Explain how to find the absolute value of any complex number.
Click here to see answer by solver91311(5072)

Question 177856: Write each function in vertex form. Sketch the graph of the function and
label its vertex.

33. y = x2 + 4x - 7
34. y = -x2 + 4x - 1
35. y = 3x2 + 18x
36.y = 1/2x2 - 5x + 12
Click here to see answer by stanbon(26259)

Question 177852: Solve each quadratic equation.

23. x2 - 16 = 0
24. 2x2 - 3x - 11 = 0

25. x2 + 3x - 10 = 0
26. 3x2 + 48 = 0

27. x2 - 5x + 4 = 0
28. 2x2 - x + 1 = 0
Click here to see answer by stanbon(26259)

Question 177847: please grahph these
[>] means equal or greater than..
() means ablsoule value.. thanks for helping

y>x-5
3x+y[<]-2

y[<]x+2
y>(x-3)+1
Click here to see answer by stanbon(26259)

Question 177848: please Graph each point.
12. (0, 4, 0)
13. (-4, 0, 0)

14. (2, 0, 5)

15. (3, 0, -2)
16. (4, 1, -1)
17. (3, -3, 1)
Click here to see answer by Fombitz(2113)

Question 177844: Solve each system of equations. please help me with these.. thanks

5x + 4y - z = 1
2x - 2y + z = 1
-x - y + z - 2

x + y + z = 0
2x + 3y 1 2z = -1
x - y + z = 2

x + 2y = 0
4x -z = 4
5y + z = -1

Click here to see answer by MathTherapy(336)

Question 178092: I need the work shown for this:
Find two points such that their coordinates are integers (positive AND negative numbers) and the distance between them is 10.
Click here to see answer by gonzo(654)

Question 178153: The graph of y=x is translated up 3 units and left 2 units. What is the equation of the new graph?

please graph..[] means absoulte value

y=[x-1]-3
y=[x+2]

y=3x-1
Click here to see answer by stanbon(26259)

Question 178484: Fill in the chart given this linear equation:
3x - y = -10
**Type all your work below the chart.
x y
-2 4
-1
0
1
2

Click here to see answer by Mathtut(3670)

Question 178807: Factor 16a^2 - 4b^2
Click here to see answer by Mathtut(3670)

Question 179187: 2x=5x-12

Click here to see answer by Mathtut(3670)

Question 179466: find the slope and y-intercept of the line specified by the equiation 2x+3y-9=0
Click here to see answer by jojo14344(1483)

Question 179549: Find the point-slope form of the equation of the line passing through the points (8,-7) and (-7,-5)
Click here to see answer by Alan3354(6059)

Question 179905: x2-x-2=0 how to solve that
Click here to see answer by Fombitz(2113)

Question 180055: Reduce to the lowest terms 3xy -5x / 2x -3xy .
Click here to see answer by Mathtut(3670)

Question 180047: Solve the equation x -2 squareroot x = 8
Click here to see answer by Mathtut(3670)

Question 180070: 1. Please help with factoring completely
x^2+10x+24

2. x^2+17x +60
3. 5x^2+6x+1
4. 3x^2-7x+2
5. 9w^2-100
6.p^2-25
Thank you
Click here to see answer by stanbon(26259)

Question 180088:
I know you have to subtract 2 from each side or 2/3 from each side, but I do not know how to find the anwser for what X equals after that. Please help me explain this.
Thank you
Click here to see answer by stanbon(26259)

Question 180113:
Please help, so I just muliply everything by itself 3 times?
Click here to see answer by stanbon(26259)

Question 180129:
Click here to see answer by Mathtut(3670)

Question 180147: what is the slope of a line 2x +5?
Click here to see answer by Alan3354(6059)

Question 180147: what is the slope of a line 2x +5?
Click here to see answer by solver91311(5072)

Question 180306: y=2x+6
4x+2y=13
Click here to see answer by HyperBrain(694)

Question 180878: Hello,
Find an equation of the line having given slope and containing the given point.
m=6/7, (3,-6)
I'm having a problem. I can't solve the equation, I can only get to the steps below.
y-(-6)=6/7(x-3)

Click here to see answer by Alan3354(6059)

Question 181060: What is the linear function for
slope= -6 x intercept 8
slope= 2 y intercept 7
Points= (3,4), (5,9)
Click here to see answer by Mathtut(3670)

Question 181459: write ech eqation in slope intercept form
y+3=-3(x-6)
Click here to see answer by HyperBrain(694)

Question 181458: write ech eqation in slope intercept form
y+3=3(x-6)
Click here to see answer by HyperBrain(694)

Question 181471: If x=a, it follows that x^2=ax
Thus x^2 - a^2 =ax - a^2
or (a+x)(x-a) = a(x-a)
therefore x+a = a
2a = a
2= 1
Now I know 2 is not = 1. I am strugglling to figure out where I went wrong in the sum I tried to solve above. Please help!!
Click here to see answer by Alan3354(6059)

Question 181609: 5x+y=10
Find the intercepts
Click here to see answer by josmiceli(3003)

Question 181795: Factor completely
30z^8 + 44z^5 +16z^2
24x² + 14xy +2y²
9x² + 49
(m+n)(x+3) + (m+n)(5+5)
Factor by grouping
10x² -12xy + 15xy – 18y²
27x² - 11x -90

Click here to see answer by Alan3354(6059)

Question 182651: Please help me solve .... 41950 = x+.82x
Click here to see answer by Alan3354(6059)

Question 182651: Please help me solve .... 41950 = x+.82x
Click here to see answer by tduplexe(1)

Question 183071This question is from textbook Contemporary Linear Algebra
: Let u = (1,-1,3,5) and v = (2,1,0,-3). Find scalars a and b so that
au + bv = (1,-4,9,18).
I would like to know the steps on how to solve for scalars a and b.This question is from textbook Contemporary Linear Algebra

Click here to see answer by jim_thompson5910(13787)

Question 183119This question is from textbook Contemporary Linear Algebra
: 17. In each part, sketch the vector u + v+ w, and express it in component form.

(What am I doing wrong? I got the coordinate points of each initial point of the vectors and head of each vector, then I applied the formula and I am not getting the same answer as the book which is (-2,5). The head point for u is (5,-5), v is (-5,-3), and W is (-2,5). The coordinates for the initial points are u = (0,0), v = (5,-5), and w is (-5,-3).
Initial points: u= (0,0) V= (5, -5), w = (-5,-3)
Terminal Points u= (5,-5), v= (-5,-3) and w= (-2,5)

This question is from textbook Contemporary Linear Algebra

Click here to see answer by stanbon(26259)

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