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

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Question 1043962: If 360=2x�3y�5z ;than find x+y+z
Click here to see answer by ikleyn(52786)

Question 1043966: multiply using formula :(a+b+c) (b+c-a) (c+a-b) (a+b-c)
Click here to see answer by josgarithmetic(39617)

Question 1043183: (1) Write the following sets of linear equation in augumented matrix form and solve for x1, x2, and x3 using Gauss Jordan Elimination method:
(a) 2X1 + X2 - X3 = 8
-3X1 - X2 + 2X3= -11
-2X1 + X2 + 2X3= -3
(b) 3X1 - X2 + 5X3 =-2
2X1 + 4X2 - X3 =3
-4X1 + X2 + 7X3 =10
(2) Using elementary row operations investigate the consistency of the following systems.
(a) 2X1 + 4X2 - 2X3 = 0
3X1 + 5X2 =1
(b) X1 - X2 + 2X3 =4
X1 + X3 = 6
2X1 - 3X2 + 5X3 =4
3X1 + 2X2 - X3 =1
(3) consider the system
X1 + 2X2 + 3X3 = a
2X1 + 5X2 + (a+5)X3 = -2+2a
- X2 + (a^2 - a)X3 = a^2 - a
find the values of a for which the system has
(a) No solution (b) exactly one solution (c) Infinitely many solutions.
thank you.

Click here to see answer by solver91311(24713)

Question 1044065: a man is 24 years older than is son 12 years ago he was 5 times as old as his son. find the present ages of the both

Click here to see answer by josgarithmetic(39617)

Question 1044114: Could you help me solve this Linear Equation please?
and
Thank you so much
Click here to see answer by Fombitz(32388)

Question 1044116: There are benches in a classroom. If 4 students sit on each bench, three benches are left vacant; and if 3 students sit on each bench three students are left standing. What is the total number of students in the class.?
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Question 1044277: the mean of x and 4x is 10, x = ?
Click here to see answer by richard1234(7193)

Question 1044519: Need help solving this equation (substitution)
4x-2y-8=8y-6x-2
3(x-y+1)=3y-2x-9
My algebra teacher gave us the answer, x = 6 ; y = 7, but I can't get to that answer as I try solving the equation.
Thank You
Click here to see answer by Edwin McCravy(20056)

Question 1044527: solve the system
7x-y=31
2x+3y=-1
Click here to see answer by ikleyn(52786)

Question 1044322: The average monthly income of a person for first eight months of a year exceeds that for first seven months of the year by 25. If he earna 1275 in eight month of the year find his average monthly income for the first eight months of the year
Click here to see answer by Boreal(15235)

Question 1044595: Tom and Bill are standing at two places on a straight road. Tom starts
walking toward Bill and arrives at Bill's original place 11 minutes after
Bill had left. At perhaps a different time, Bill starts walking toward Tom
and arrives at Tom's original place 15 minutes after Tom had left. When
each reaches the other's original place, he immediately turns and starts
back, and they meet in the center at 4:00. Assuming that they walked at
constant rates, when did each start to travel on the road?
Click here to see answer by KMST(5328)

Question 1044701: 2(x�y)+4(xy3) problem

Click here to see answer by kaylasari(1)

Question 1044701: 2(x�y)+4(xy3) problem

Click here to see answer by Alan3354(69443)

Question 1044997: Good Evening. Please help me solve this system of linear equation:
(3/2)x+(2/3)y=1
(2/3)x-(3/2)y=0
Thnak You!

Click here to see answer by Boreal(15235)

Question 1045061: How do i answer 4x + 3y=13
2x - 7y= 15
Click here to see answer by josgarithmetic(39617)

Question 1045061: How do i answer 4x + 3y=13
2x - 7y= 15
Click here to see answer by MathTherapy(10552)

Question 1045077: How would I graph 7x-5y=52 2x+5y=47
Click here to see answer by Alan3354(69443)

Question 1045103: 3x+4=3x-5
Click here to see answer by jim_thompson5910(35256)

Question 1045324: If 2016 = 2^x*3^y*5^z*7^u are non negative integers, the value of x+y+2016z+3u will be a)10 b)11 c)12 d)13
Click here to see answer by ikleyn(52786)

Question 1045395: Determine the ordered pair solution for the given linear equations. State the ordered pair solution to two decimal places.

1.23y-0.37x=-1.17 and -0.25x-1.57y=2.35
Click here to see answer by Alan3354(69443)

Question 1045394: Determine the ordered pair solution for the given linear equations. state the answer in 2 decimal places.

-x/5-y/7=3 and y/3-x/2=1/11
Click here to see answer by rothauserc(4718)

Question 1045599: A snack mix is made from peanuts that cost $3.30 per pound and caramel popcorn that cost $2.70 per pound. The mixture costs $3.10 per pound. Does the mixture contain more peanuts or more popcorn?
Click here to see answer by josgarithmetic(39617)

Question 1045815: Trying to solve for Y. The problem is Y - 2x = 15
Click here to see answer by Alan3354(69443)

Question 1046106: Solve the systems of equations graphically and check x-y=5 y=-2x+4
Click here to see answer by ewatrrr(24785)

Question 1046155: 3x-2y=3 ;2x+y=16 find dx and dy
Click here to see answer by Alan3354(69443)

Question 1046348: Yes I know the answer but cannot come up with the two equations for it.
Two cars leave Salt Lake City, traveling in opposite directions. One car travels at a speed of 80 km/h and the other 96 km/h. In how many hours will they be 528 km apart?

Click here to see answer by ikleyn(52786)

Question 1046363: 2x+3y=19
X+5y=27
How do you solve problems such as this one? Thank you!
Click here to see answer by Alan3354(69443)

Question 1046452: What is the slope of A(-3,1) D(4,5)
Click here to see answer by Alan3354(69443)

Question 1046498: X=y+4
2x+y=12
How do you solve problems such as this one?
Click here to see answer by Alan3354(69443)

Question 1046777: Referring to the figure, find the slope of the line shown.

http://www.ppstest2.com/images2/AL4003.jpg
NEED ASAP PLEASE
Click here to see answer by rothauserc(4718)

Question 1046997: slope 6 y intercept 0,3
Click here to see answer by Boreal(15235)

Question 1046997: slope 6 y intercept 0,3
Click here to see answer by solver91311(24713)

Question 1047008: In the algebraic expression 5x + 8y � 12z, the values 5, 8, and �12 are _____

Click here to see answer by Timnewman(323)

Question 1047008: In the algebraic expression 5x + 8y � 12z, the values 5, 8, and �12 are _____

Click here to see answer by solver91311(24713)

Question 1047012: Simplify �4(6x � 7) � 3(4 + 2x).

Click here to see answer by stanbon(75887)

Question 1047012: Simplify �4(6x � 7) � 3(4 + 2x).

Click here to see answer by MathLover1(20850)

Question 1047010: Evaluate 5x � 2y + (7x � y) for x = 7 and y = �2.

Click here to see answer by stanbon(75887)

Question 1047011: Simplify x + x^2 + 2x^2 � 3x.

Click here to see answer by Edwin McCravy(20056)

Question 1046826: Two factory plants are making TV panels. Yesterday, Plant A produced 8000 panels. 6% percent of the panels from Plant A and 2% of the panels from Plant B were defective. How many panels did Plant B produce, if the overall percentage of defective panels from the two plants was 3%?
Click here to see answer by Theo(13342)

Question 1047038: A company mannufactures solar powered calculators and battery powered calculators. In one day a maximum of 110 solar powered and 80 battery powered calculators can be made. Each solar powered calculator requires 1 work hour to produce and each battery powered calculator requires 2 work hours. There are a maximum of 200 work hours available each day.
Click here to see answer by Alan3354(69443)

Question 1046799: solve:7(x+4)-2/3 (x-6)<2[x-3(x+5)]
THANK YOU
Click here to see answer by Alan3354(69443)

Question 1047201: X^2-Y^2+4X-4Y
Click here to see answer by stanbon(75887)

Question 1047249: At a store three notebooks and two pencils cost $2.80 at the same prices two notebooks and five pencils cost $2.60 find the cost of one notebook and one pencil
Click here to see answer by ewatrrr(24785)

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