Questions on Algebra: Systems of Linear Equations answered by real tutors!

Tutors Answer Your Questions about Linear-systems (FREE)

Question 386872: {3v-2w=1
{2v+2w=4
Click here to see answer by mananth(12270)

Question 386831: I need to find the slope of the line containing (-9, 1/2) and (-5, 1/2).
Click here to see answer by rfer(12666)

Question 386835: I need to find the slope of 2x-5y+19=0.
Thank you
Click here to see answer by rfer(12666)

Question 386996: I am trying to solve this one for homework.
y=2+log x
y=3/4x+5
Can someone help? I would really appreciate it!!
Denise
Click here to see answer by stanbon(57379)

Question 387021: etermine the equation of the line described. Put answer in the slope-intercept form, if possible.
Through (-7, -5), perpendicular to 2x + 7y = -49
Click here to see answer by ewatrrr(10682)

Question 387023: If the point (-3,1/2) lies on the graph of the equation 2x+ky=-11, find the value of k.
a. -5/2 b. -34 c. -17/2 d. -10 e. none of the above
i came across this and i dont remember??
Click here to see answer by ewatrrr(10682)

Question 387061: one type of cattle feed is 4% protein while a second type is 13% protein. how many pounds of each type must be mixed to make 45 pounds of mixture that is 10% protein?
Click here to see answer by nerdybill(6962)

Question 387118: A=4b
A-b=9
Click here to see answer by tara0066(31)

Question 387118: A=4b
A-b=9
Click here to see answer by stanbon(57379)

Question 387149: use substitution to solve the liner system y=2x-2 and 5x-2y=18
Click here to see answer by rfer(12666)

Question 387179: Good Evening!
I am trying to solve the following by elimination:
{9/2x+1/2y=17/2
{x-5/2y=9/2
Thanks!
Jim
Click here to see answer by stanbon(57379)

Question 387183: Please help solve this equation:
Solve the system of equations using substitution. Be sure to write your answer as an ordered pair
y = 2x + 1
7x-y=26

Thanks!
Click here to see answer by stanbon(57379)

Question 387180: Please help me solve this equation:
If 2x + 2y = 10 and y = x + 1, what is the value of x?
Thanks!
Click here to see answer by stanbon(57379)

Question 387180: Please help me solve this equation:
If 2x + 2y = 10 and y = x + 1, what is the value of x?
Thanks!
Click here to see answer by gwendolyn(128)

Question 387261: Is the relationship below linear? Tell how you decided. Write an equation for the linear relationship.
x 5 10 15 20 25 30
y 20 30 40 50 50 50
I am completely lost. I tried understanding what my chapter was saying but it is only confusing me more.
Am I even on the right track?
x/y 5/20 10/30 15/40 20/50 25/50 30/50
x/y .25 .333 .375 .4 .5 .6
Click here to see answer by robertb(4012)

Question 387443: solve by elimination method 5x+7y=12, x-4y=-3
Click here to see answer by Alan3354(30993)

Question 387678: I need to complete a table for this equation and I am not sure how to do so.
y= -1/2x-4
x y (x,y)
-1
-2
Thank you!
Click here to see answer by stanbon(57379)

Question 387678: I need to complete a table for this equation and I am not sure how to do so.
y= -1/2x-4
x y (x,y)
-1
-2
Thank you!
Click here to see answer by Alan3354(30993)

Question 387695: is X=22 linear or non-linear or not a function?
Click here to see answer by jim_thompson5910(28598)

Question 387708: Solve the formula for T
k = c + Tm

Click here to see answer by user_dude2008(1861)

Question 387698: Use the discriminant to determine whether the following equations have solutions that are: two different rational solutions; two different irrational solutions; exactly one rational solution; or two different imaginary solutions.
2x2 + 6x – 7 = 0

Click here to see answer by robertb(4012)

Question 387754: A labourer is engaged for 20 days on the condition that he will receive Rs 60 for each day he works and will be fined Rs 5 for each day he is absent. If receives Rs 745 in all, for how many days did he remain absent?
Click here to see answer by Earlsdon(6287)

Question 387815: solve the lnear equatin by using elimnation
x+5y=28
-x-2y=-13
Click here to see answer by Alan3354(30993)

Question 387887: solve the system x-y-5z+-13
4x+2y+2z=6
3x-2y+2z=24
Click here to see answer by Alan3354(30993)

Question 387839: How would i find a b and c if a+b=13, b+c=16 and a+b=19.
Click here to see answer by rfadrogane(214)

Question 387912: what is the slope of 4x=7y=16
Click here to see answer by stanbon(57379)

Question 387912: what is the slope of 4x=7y=16
Click here to see answer by rfadrogane(214)

Question 387981: solve by the substitution method.
2x - 7y=15
5x + 45=y
Click here to see answer by jsmallt9(3296)

Question 388095: 3x=x+18

Click here to see answer by learningalgebra13(2)

Question 388139: What are the solutions for x,y, and z in the following equations:
x-y+9z=-27
2x-4y-z=-1
3x=6y-3z=27

Click here to see answer by Fombitz(13828)

Question 388226: TO SOLVE FOR THE TRHEE UNKNOWNS X,Y,Z FROM
Z=4*(X+Y)
Z=2*X*Y
Click here to see answer by Fombitz(13828)

Question 387820: What is the percentof change formula?
Click here to see answer by Fombitz(13828)

Question 388335: Solve by the elimination method
2r-5s=-33
5r+2s=48
I think the answer is that there is no solution but I am not sure. Please someone help me to solve this
Click here to see answer by jim_thompson5910(28598)

Question 388475: Find the value of |1 2 -1||3 -2 1||0 1 -3|
A. 26
B. 22
C. -16
D. 20
Thank you so much!!!
Click here to see answer by Alan3354(30993)

Question 388478: Find the inverse of [3 1][-4 1], if it exists.
A. does not exist
B. 1/7[1 3][4 -1]
C. 1/7[1 -1][4 3]
D. 1/7[-3 -4][1 -1]
Thank you so much!!!
God Bless and Happy Holidays!!!!
Click here to see answer by Jk22(389)

Question 388489: Which is the graph of the system: y<=0, x<=0, x>=y, x+y>=-4
Click here to see answer by Fombitz(13828)

Question 388492: Find the maximum and minimum values of f(x,y)=2y+x for the polygonal convex set determined by this system of inequalities. x>=1, y>=0, x<=4-y
A. minimum: 1; maximum: 4
B. minimum: 0; maximum: 5
C. minimum: 1; maximum: 7
D. minimum: 4; maximum: 8
Click here to see answer by Fombitz(13828)

Question 388474: Find DE if D=[-2 4 6][5 -7 1]and E=[1 -2][0 4][-3 4]
A. [-20 44][8 -42]
B. [-2 -10][0 -28][-18 -4]
C. [-20 8][44 -42]
D. [-2 0 -18][-10 -28 -4]
Thank you for your help!!!
God Bless and Happy Holidays!!!
Click here to see answer by Jk22(389)

Question 388129: 3 squares with the first square's side length is 4 units, the next one to the right has side length of x units and the next square to the right has side length of 9 units. there is a straight line which's coordinates lies on the topleft vertices of each 3 squares.
=> what is the side length of the middle square?

Click here to see answer by CharlesG2(828)

Question 388539: I need help with the equation 3c +4m = 12.5
Please show how you found the answer. Thank you
Click here to see answer by Alan3354(30993)

Question 388577: Ques. 20
Referring to the graph, write the equation of the horizontal line through the point (3,0).
Figure located at this link:
http://ppstest2.com/images2/AL5005.jpg
I need these answers to be as straightforward as possible. No shown work is needed. *Thank you for all simply put answers*
Click here to see answer by solver91311(16897)

Question 388575: Ques.19
Referring to the figure, write the equation of the horizontal line through the point (0,3).
Figure located at this link:

http://ppstest2.com/images2/AL5005.jpg
I need these answers to be as straightforward as possible. No shown work is needed. *Thank you for all simply put answers*
Click here to see answer by solver91311(16897)

Question 388571: Ques 16.
Write an equation in point-slope form of the line that passes through the points (-5,-4) and (7,-5).
I need these answers to be as straightforward as possible. No shown work is needed. *Thank you for all simply put answers*

Click here to see answer by solver91311(16897)

Question 388570: Ques.14
Write an equation of a line that is perpendicular to y = 2x + 3 and passes through (3,4).
I need these answers to be as straightforward as possible. No shown work is needed. *Thank you for all simply put answers*

Click here to see answer by solver91311(16897)

Question 388567: Ques. 13
Write an equation in slope-intercept form of the line that passes
through the points (-2,-1) and (3,5).
I need these answers to be as straightforward as possible. No shown work is needed. *Thank you for all simply put answers*
Click here to see answer by solver91311(16897)

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