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

Tutors Answer Your Questions about Linear-systems (FREE)

Question 111067: 12-4h=-18+11h
-6=7h
h=-6/7
Click here to see answer by checkley71(8403)

Question 111066: n-4(1+5)=-2
n-4-20n=-2
4+21n=-2(+4)
21n=2
n=10.5

Click here to see answer by checkley71(8403)

Question 111134: Please help me solve for x, y, z. I understand how to solve for two variables but I don't understand how to solve for three.
Solve for x, y, and z.
X + Y + 2Z =5
X + Y =5
X + 3Y + Z =11

Click here to see answer by dolly(163)

Question 111177: Sir i need u help at the earliest .
1. Solve by elimination method:-
4x+5y=6
2/3x-5y=7
2.Solve by substitution method:-
5x+6y=7
7/8x+9/10y=3/4
thank u ........
Click here to see answer by solver91311(16897)

Question 111493: A rectangle has sides of 3x – 4 and 7x + 10. Find the expression that represents its perimeter.
Click here to see answer by solver91311(16897)

Question 111503: 1. 3(5x-9)-x=-12+4x

2. 20-6x=-4(2X-1)+2
please show the steps to the answer so that I can get an understanding of how to complete the problem. Thank you.
Click here to see answer by stanbon(57361)

Question 111545: 20-6x= -4(2x-1)+2
and
3(5x-9)-x= -12+4x
i've answered the first problem already but i'd like to see if you end up with the same answer but i seem to not be able to answer the second problem. Thank you for your time and i greatly appreciate your help!
Click here to see answer by brandonpark2889(31)

Question 111546: how do I solve this algebra problem?
Solve for "t" in the equation:
7st + 13 = 2s
Click here to see answer by solver91311(16897)

Question 111570: i need help solve 2x^2-3x-2=0 using the quadratic formula
Click here to see answer by jim_thompson5910(28595)

Question 111568: if f(x)=2x^2-7x+3,find the answer to
1. f(2)
2. f(-3)
Click here to see answer by jim_thompson5910(28595)

Question 111490: Find the length of each side of the rectangle so that it has the given perimeter.

2x-5
p=50 in.
Click here to see answer by elima(1433)

Question 111671: please help me solve this
a.calculate the value of the discriminant of x^2+x+3=0
b.by examining the sign of the discriminant in part a, how many x-intercepts would the graph of y=x^2+x+3 have?why?
this is under 1 problem. thank you tutor.
Click here to see answer by Earlsdon(6287)

Question 111724: Use substitution to solve: 2x+y=7,5x-2y=4
Click here to see answer by jim_thompson5910(28595)

Question 111729: Use elimination to slove: 3x-2y=6
x-2y=-2
Click here to see answer by jim_thompson5910(28595)

Question 111668: A small firm produces both AM and AM/FM car radios. The AM radios take 15 h
to produce, and the AM/FM radios take 20 h. The number of production hours is
limited to 300 h per week. The plant’s capacity is limited to a total of 18 radios per
week, and existing orders require that at least 4 AM radios and at least 3 AM/FM
radios be produced per week. Write a system of inequalities representing this situation.
Then, draw a graph of the feasible region given these conditions, in which x
is the number of AM radios and y the number of AM/FM radios.
Click here to see answer by ankor@dixie-net.com(15656)

Question 111861: Hi-
I have been working on this problem and I think I am doing it right. I am about halfway done if I am doing it correctly.
Solve the system by addition:
2x-4y=7
4x+2y=-1
What I did was multiply the second equation by (2)
(2)(4x+2y=-1)
8x+4y=-2
2x-4y=7
_____________
10x/10 = 5/10
and I come up with
x= 1/2
Is that correct?
If so how do I replace work the problem so that I can solve for y?
I am not certain how to multiply to get rid of the fraction at the bottom?
what should I do next?
Click here to see answer by jim_thompson5910(28595)

Question 111869: I am working on the following problem and hope I did it right.
Adult tickets for a play cost $15 and child tickets cost $6. If there were 33 people at a performatnce and the theater collected $360 from ticket sales, how many children attended the play?
Let X= Adult tix
Let Y= Child tix
1x+1y=33
15x+6y=360
Then I had to multiply the first equation by 15.
(15)(1x+1y) = 33(15)
15x+15y= 495
Then I had to multiply the other equation by -1
(-1)(15x+6y) =360(-1)
-15x-6y=-360
Then I had to add both equations together.
15x+15y=495
-15x-6y=-360 the result was
9y=135
I divided both sides by 9
and came up with y=15.
Is that correct?
I tried to check my work by inputting
1x+1(15)=33
1x+15=33
then subtracted 15 from both sides and came up with x=18.
When I tried to check my work
15(15) +6(18)this is supposed to =360 and I don't think that came out right.
What did I do wrong?
Thank you.
Tracy

Click here to see answer by checkley71(8403)

Question 112108: Solve the system of equations y=2x-10 and x-y=7
Click here to see answer by jim_thompson5910(28595)

Question 112104: Solve the system by substitution.
5x + 3y = –19
y = –2x – 8

Click here to see answer by jim_thompson5910(28595)

Question 112100: Adult tickets for a play cost $8 and child tickets cost $6. If there were 25 people at a performance and the theater collected $188 from ticket sales, how many adults and how many children attended the play?
Click here to see answer by jim_thompson5910(28595)

Question 112087: Use elimination to solve: x/2+2y=9
2x-y=18
Click here to see answer by jim_thompson5910(28595)

Question 112307: Solve the system of equation. If the system is consistent, state the coordinates of the point of intersection. If not consistent, state whether it is inconsistent of dependent.
x-y=3
2x+3y=11
Click here to see answer by jim_thompson5910(28595)

Question 112582: Edna Britten's income from two stocks each year totals $280. Stock A pays dividends at the rate of 5% and stock B at the rate of 6%. If she has invested a total of $5000, how much is invested in each stock?
Click here to see answer by josmiceli(9681)

Question 112584: A chemist has 1000 g of a solution that is 40% acid. How many grams of water must be added to reduce the acidity to 25%?
Click here to see answer by checkley71(8403)

Question 112586: The length of a rectangle is 5 more than twice the width. The perimeter is 130. What is the area?
Click here to see answer by checkley71(8403)

Question 112619: I really need some help!!!! Please!
Solve this system of equation using either addition or substitution method.
George has two investments that yield a total of 185.60 in annual interest. The amount onvested at 8% is 320$ less than twice the amount invested at 6%. How much is invested at each rate.
Amount invested at 8% _____________
Amount invested at 6% _____________
Click here to see answer by scott8148(6628)

Question 112638: in solving systems of linear equations how do you know whether to eliminate the x's or y's?
Click here to see answer by bucky(2189)

Question 112646: Can you explain me how to solve this problem
Solve the following system
x+3y=11
6x-2y=7

Click here to see answer by bucky(2189)

Question 112663: Please help.
Solve the following system by graphing.

3x - 6y = 9
x - 2y = 3
Thanks
JMS
Click here to see answer by chitra(359)

Question 80921: Can you please help me with this question I am totally clueless as to how to answer this question the working that is.
Given a line containing the points (1,3) , (2,4) , (3,5) determine the slope- intercept form of the equation, give one additional point on this line and graph the function.
Thank you in advance.

Click here to see answer by mathnard(10)

Question 112754:
A contractor mixes concrete from bags of pre-mix for small jobs. How many bags with 4% cement should he mix with 10 bags of 11.6% cement to produce a mix containing 8% cement?

Click here to see answer by checkley71(8403)

Question 112802: please help me sove this problem
6x-2y=2
9x-3y=1
I need to know how to graph
Click here to see answer by checkley71(8403)

Question 113157: Having a real hard time with this...please help!
Solve system of equation word problem but either addition method or substitution method.
6x+2y=8
y=-3x
Click here to see answer by stanbon(57361)

Question 113232: I just need help setting up the equations and I can do the rest. Word problems have never been easy for me!
Substitution method or addition method from system of equations
George has two investments that yield a total of $185.60 in annual interest. The amount invested at 8% is $320 less than twice the amount invested at 6%. How much is invested at each rate?
Amount invested at 8%?
Amount invested at 6%?
Click here to see answer by SHUgrad05(58)

Question 113372: write the point slope form of the equation of the line that passes through the point and has the given slope, then rewrite the equation in slope-intercept form
(-2, 4), m = 3
Thanks for help
Click here to see answer by checkley71(8403)

Question 113371: write the point-slope form of the equation of the line that passes through the two points

(4, -2), (-9, 5)
Thanks for help
Click here to see answer by checkley71(8403)

Question 113748: how do write this as a fraction? 7.937
thank you
Click here to see answer by checkley71(8403)

Question 113929: -5x+2y=10
x-3y=11
solve using addition method
Click here to see answer by jim_thompson5910(28595)

Question 113962: Write the equation of the line passing through (4, 4) and (4, 2).
Click here to see answer by checkley71(8403)

Question 113964: Write the equation of the line which has y-intercept (0, 5) and is perpendicular to the line with equation y = –3x + 1.
Click here to see answer by stanbon(57361)

Question 113975: find three consecutive integers such that the sum of the first two integers is 24 more than the third integer.
Click here to see answer by checkley71(8403)

Question 113983: Given f(x) = 5x2 – 3x + 1, find f(–2).
Click here to see answer by checkley71(8403)

Question 113986: Bob invested $20,000, part at 14% and part at 13%. If the total interest at the end of the year is $2,720, how much did he invest at 14%?
Click here to see answer by checkley71(8403)

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