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

Tutors Answer Your Questions about Linear-systems (FREE)

Question 356665: Please teach me how to solve this question.
-3x-4y=2
3x+3y=-3
Click here to see answer by Fombitz(32388)

Question 356725: graph the line with the given slope that contains the given point.
slope=-1/2;(3,1)

Click here to see answer by mananth(16946)

Question 356740: 8x^3-27
Click here to see answer by mananth(16946)

Question 356680: Solve for x, y, and z. Use only linear combination and/or substitution. Do not use matrices.
2x - 12y + 3z = -19
4x + 6y - 2z = 14
6x - 9y - 4z = 13

Click here to see answer by Fombitz(32388)

Question 356861: 0x+y=-2
Click here to see answer by Alan3354(69443)

Question 356671: 1. Compute the Fourier transform of the following signals.
2. (a). x(n) = u(n) � u(n-6)
3. (b). x(n) = 2nu(-n)
4. (c). X(n) = (1/4)nu(n+4)
5. (d). x(n) = (ansin(won)) u(n), |a|<1

Click here to see answer by Fombitz(32388)

Question 356669:
1. Let X(k) denote the N-point DFT of the N-point sequence x(n)
a) If x(n) = � x(N � 1 � n), find X(0) for N even and N odd.
b) If N is even and x(n) = x(N � 1 � n), find X(N/2).

Click here to see answer by Fombitz(32388)

Question 356890: Tickets at a park are $1.50 for kids and $4.00 for adults. On c certain day 2200 people entered the park, and the the admission fees collected totaled $5050. How many children and how many adults were admitted?
Click here to see answer by user_dude2008(1862)

Question 356552: Solve the system algebraically by the substitution method:
y= (x+1)^3
y= sq rt of (x-1)
Click here to see answer by Fombitz(32388)

Question 357006: A mobile phone company offers two monthly calling plans, A and B. Under A, every
minute costs $ 0.10. Under B, the first 100 minutes costs $ 12 and every extra minute costs $ 0.08. What monthly talking time would make B the better choice?
Click here to see answer by mananth(16946)

Question 357129: The function H described by H(x)=2.75+71.48 can be used to predict the height in cm of a woman whose humerus is x cm long Predict teh height of a woman whose humerus is 30cm long
I believe that I am making this harder than it really is but I am so stumped
30(x)=2.75x+71.48
30(x)=74.55
x=2.485
Am I anywhere close
Click here to see answer by jim_thompson5910(35256)

Question 357134: elimination method
4x+5y=2
8x+10y=4

40x+50y=20
40x+-50y=40
80x=40
x=.5
4(.05)+5y=2
2+5y
y=4/5

Not quite sure if this is correct Can you help me please
Click here to see answer by user_dude2008(1862)

Question 357159: How do I find the fourth point for a rectanlge? I can use the other three to find out with a graph, but I do not know how to set up an equation.

Click here to see answer by jim_thompson5910(35256)

Question 282002: Graph this equation.
y=-2x+4

Click here to see answer by jim_thompson5910(35256)

Question 357149: Train A and B are traveling in the same direction on parallel tracks. Train A is traveling at 100 miles per hour and Train B is traveling at 104 miles per hour. Train A passes a station at 11:10 am. If train B passes the same station at 11:40 am at what time will train B catch up to train A
_____am or _______pm

Can some one please help me. Not sure on how to set up the equation
Click here to see answer by checkley77(12844)

Question 357184: 5/4x+1/8x=3/8+x Can I please have some one help me
Click here to see answer by neatmath(302)

Question 357097: The larger of two numbers is 8 times the smaller. If the larger number exceeds the smaller by 56, find the numbers.
Click here to see answer by neatmath(302)

Question 357301: Hi Guys, really struggling with this question.
Given the Cartesian equation of a circle in the form
x^2+y^2+8x-8y+16=0
Find by completing the squares, the centre coordinates of the circle and its radius, Hence sketch the graph of the circle taking care to label the x-axis and y-axis and the origin.
Click here to see answer by ewatrrr(24785)

Question 357417: In need of assistance problem solving: 4/5x=16 m/-3=10 4/5x=16
Click here to see answer by edjones(8007)

Question 357467: whats the slope of the line with these points (2,5)(6,8)
Click here to see answer by nerdybill(7384)

Question 357470: When the digits of a two-digit number are reversed, the new number is 9 more than the original number, and the sum of the digits of the original number is 13. What is the original number?
Click here to see answer by ankor@dixie-net.com(22740)

Question 357672: 3x-2y=15
x+y=1
Click here to see answer by mananth(16946)

Question 357712: Airplane Speed:
Two planes start from the same airport and fly in opposite directions. The second plane starts 1/2 hour after the first plane, but its speed is 80 kilometers per hour faster. Find the groundspeed of each plane if 2 hours after the first plane departs the planes are 3200 kilometers apart.
I am assuming that the distance = rate x time equation will be used, but I am lost.
Click here to see answer by scott8148(6628)

Question 357749: The trip of the Amazon River in canoes and back to the mouth of the Amazon took 12 hours. Going upstream, the canoes traveled at 5km/h, but downstream they traveled 10 km/h faster. how far upstream did they go?
Click here to see answer by mananth(16946)

Question 357543: what is -8x+3=2x+11
Click here to see answer by nyc_function(2741)

Question 357753: I need help with 2(6-2x)=-9x-1/2(-4x+6).
Click here to see answer by rfer(16322)

Question 357762: Solve the following system by the addition method.
1/2x-1/3y= -4
-1/12x+1/10y= 2
x=
y=
Click here to see answer by jsmallt9(3758)

Question 357715: Find the value of k such that the system of equations is inconsistent.
15x- 3y = 6
-10y+ ky = 9
Click here to see answer by Fombitz(32388)

Question 357999: How do you solve e=wp, for p
Click here to see answer by jim_thompson5910(35256)

Question 358014: 4m-n=m, for m
Click here to see answer by jim_thompson5910(35256)

Question 358018: 7a-b=15a, for m
Click here to see answer by Fombitz(32388)

Question 358021: -5c+d=2s, for c
Click here to see answer by Fombitz(32388)

Question 358099: 4(x-3)=48
Click here to see answer by checkley77(12844)

Question 358322: show all work 14x-3=10x+1
Click here to see answer by user_dude2008(1862)

Question 358365: I need help with a linear word problem and equation (Please explain how you got your answer because I'm confused. Thank you.):
Fundrasing: To raise money, your student council is selling magazine subscriptions. The student council will receive a one-time bonus of $150 from the magazine publisher plus 38% of the subscription money. The following verbal model represents the situation. Write a linear equation from the verbal model.
Money = Bonus + Subscription . Subscription
Raised Percentage Money
What I got was m=150+0.38x.
One more thing:
How much subscription money is needed for the council to raise a total of $300? Round your answer to the nearest dollor.
Click here to see answer by solver91311(24713)

Question 358474: Please help me find the slope of p(2,-5) q(-4,3)
Click here to see answer by ewatrrr(24785)

Question 358487: Please Help!! Find an equation of the line that satisfies the given conditions
Through (-2,4) slope is -1
Click here to see answer by CharlesG2(834)

Question 358359: 2x+2y+3z=2
5x-2y+3z=0
x-5y-2z=-4
Click here to see answer by Fombitz(32388)

Question 358529: Please help find an equation of the line that satisfies the given condition....
a.) Through (-1,-2) and (4,3)
b.) Through (-3,-5) slope -7/2

Click here to see answer by checkley77(12844)

Question 358649: x+y+3z=-4
2x -z=-3
-x-y-2z=5
Click here to see answer by Edwin McCravy(20056)

Question 358653: solve system of equation by graphing then classify 2x-y=16 and 2x+3y=-8
Click here to see answer by Fombitz(32388)

Question 359074: Can you help me solve this step by step?
y=5-4x
3x-2y=12
Click here to see answer by Fombitz(32388)

Question 359298: Solve by process of elimination:
n+d+q=75
.05n+.10d+0.75q=7.25
n=5d
*this question is dealing with coins*
Click here to see answer by checkley77(12844)

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