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

Tutors Answer Your Questions about Linear-systems (FREE)

Question 9288: i really need help on this question i keep checking my answer but it doesn't add up. {2(3-x)=16(x+1)}
Click here to see answer by lucky83(12)

Question 9341: 1.4Please I need help I am a 63 year old male with two granddaug. Tring to do this all by myself. Been out of school 40 years.
Here is the question:( Subtract Decimals) Subtract "Remember to estimate." 6.38
-1.44
What gets me is the ESTIMATE
Click here to see answer by rapaljer(4671)

Question 9302: Please help me solve this equation:2x=-x+9
Click here to see answer by rapaljer(4671)

Question 9357: of 200 coins, 199 are the same weight and ine is lighter than the others. Given the same balance, explain how the lighter coin may be indentfied in no more than 5 weighings.
Click here to see answer by khwang(438)

Question 9439: , show that a characterestic polynomial is always monic.
please help me solving the above problem.
thank you

Click here to see answer by khwang(438)

Question 9754: I am trying to figure out the following problem to say what is 'b':
1/a + 2/b = 3/c
My guess is that b = c minus a
Click here to see answer by askmemath(368)

Question 9773: Hi !
I solved a word problem yesterday without any help and I was very pleased with myself. However I am just not feeling this problem. Please help me? "One side of a triangle is 2cm shorter than the base. The other side is 3cm longer than the base. WHAT LENGHTS OF THE BASE WILL ALLOW THE PERIMETER TO BE GREATER THAN 19 CM?"
Click here to see answer by Earlsdon(6294)

Question 9967: Hi Free Tutors:
I really appreciate the help you give on this site. I plugged an equation into the solver and it gave me the answer. However, I need step by step directions to be able to understand what I am doing. Here is my problem:
2/3(7/8-4x)-5/8<3/8 and this is the answer that the solver gave:x>5/32
Please show me the steps so that I can understand what I am doing?
Click here to see answer by longjonsilver(2297)

Question 10110: Hi Free Tutors:
I am having trouble with the following problme:
-2[3a-2(4a-1)]+2=2(a+1) on this problem I have tried the following steps
-6a-8a+2+2=2a+2
-14a+4=2a+2
-16a=-2
a=1/8
But according to the answer in the back of the book, answer is wrong and I am not sure what I am doing wrong.

Click here to see answer by gina(6)

Question 10266: First of all, I would like to take this opportunity to thank you for taking the time to answer my question. Here it goes:
In class, we are studying how to solve systems of linear equations using substitution. The answer key I was given said that this question was supposed to have the solution set of {(-10,2)} The answer I figured out was {(70,-82})
The question was 3x+2y= -34
y-x= 12
I would really appreciate a reply, for I would like to know how to do it before we get to the next step of solving linear equations. Thank you again for your reply on this matter.
Click here to see answer by rapaljer(4671)

Question 10317: I'M HAVING TROUBLE WITH THE FOLLOWING EQUATION, PLEASE HELP
1/5X + 1/6 = -2
Click here to see answer by Earlsdon(6294)

Question 10334: x = (3x-5)
2 4

I have tried every thing and cant figure it out please help
Click here to see answer by ichudov(507)

Question 10316: -5y+100=-30
Click here to see answer by askmemath(368)

Question 10364: The width of a rectangle is one third of the legnth. If the perimeter is 96, Find the width.
Click here to see answer by arunpaul(104)

Question 10482: Hi I need help with this problem: The directions say to find the solution by the addition method.
-x+y=2
x+y=4
If you could show how it is done I would appreciate it. Thank you..
Click here to see answer by WannabeCAgirl83(35)

Question 10556: wat is the solving equation for 104=1/2[(360-x)-x] and thanks cause me and my dad cant figuere it out
Click here to see answer by rapaljer(4671)

Question 10596: Hi Tutors:
You are providing a great service to everybody who seeks help from this site. Please help me figure this one out? 2x^4+4x^2+2x-3 is-1
Thanks!
Click here to see answer by rapaljer(4671)

Question 10610: y=2x
x+y=12

Click here to see answer by rahman(247)

Question 10605: Hello,
it has been a while since I did any linear equations and I would appreciate if you can help me with this questions:
Solve the following system of linear equations to find unique values for A and B?
i) A=1600-400B
ii) A=-200+500B
Thank you so much,
Enna
Click here to see answer by rahman(247)

Question 10601: Hi Tutors:
I submitted this problem earlier and was told to re-submit it:
The value of the function of f(x)=2x^4+4x^=2x-3 is-1. Find f(x)? I hope I worded it better this time. Thanks!
Click here to see answer by longjonsilver(2297)

Question 10761: Slope of 3, passes through a line (0,-6)
I need you to show work so I know how to do it please.
Click here to see answer by rapaljer(4671)

Question 10806: Dear Sir/Madam,
I am having difficulty finding the equation to the following problem.
The center of a circle is (1,2). A line touches the circle at a point (1,4). The line is tangent to a circle at that point. Find the equation of the line.
Click here to see answer by Earlsdon(6294)

Question 10819: Please help me solve this equation:
19 -(2x +3) = 2(x + 3) +x
My attempt:
19 - (2x + 3) = 2(x + 3) +x
19 - 2x + 3 = 2x + 3 +x
19 - 2x + 3 = 3x + 3
19 - 2x + 3 - 3x = + 3
19 +3 -3 = +3 -3
19 = x
Click here to see answer by longjonsilver(2297)

Question 10830: Hello! I posted this problem before, but nobody solved it. I'm really having trouble with this. Please help!

x + 2y + 16z = 20
3x + 6y - z = 23
4x + 8y + 2z = 18

It doesn't matter which method you use to solve this system. Just please show me all the steps. Many thanks ahead!

Click here to see answer by longjonsilver(2297)

Question 10998: I can't figure out this problem...i've tried so many websites for homework help.
2
- (10x+25)=-10-4(x+3)
5
Click here to see answer by longjonsilver(2297)

Question 11143: when people type this: "^" in an equation, does it mean an exponent? if not, what does it mean?
Click here to see answer by Earlsdon(6294)

Question 11168: 2(x-1)=-2
Click here to see answer by roxy9229(32)

Question 11227: what is the correct form of solving this problem:
132=n(n-1)
Click here to see answer by Earlsdon(6294)

Question 11418: HOW DO I FIND THE EQUATION OF A CIRCLE WHERE THE CENTER IS (-3, 4) AND A POINT ON THE EDGE IS (4, 6).
Click here to see answer by Earlsdon(6294)

Question 11418: HOW DO I FIND THE EQUATION OF A CIRCLE WHERE THE CENTER IS (-3, 4) AND A POINT ON THE EDGE IS (4, 6).
Click here to see answer by askmemath(368)

Question 11752: I dont understand how you solve equations by using multiplication and division...Can you help me understand it?
Click here to see answer by elima(1433)

Question 12043: x+5/4=3/4x
Click here to see answer by rapaljer(4671)

Question 12111: I'm having a hard time with this problem:
+=4-
my book is giving the answer 6/19 and I think I keep missing an important step. thank you!
-tracy
Click here to see answer by bonster(299)

Question 12161: through linear substitution please help find answer to:
y=-3x-18
5x-2y=-8
and through linear elimination please help find answer to:
3x-2y=1
-6x+4y=-2
Thank you,
Lee from NC
Click here to see answer by rapaljer(4671)

Question 12325: y=5x-2
Click here to see answer by elima(1433)

Question 12338: Hi Tutors: ( Rapalger, Abbie, Longjonsilver, whomever has the time)
I asked for help last night with this problem and it seemed like nobody was available to help me. So I am trying again. The topic is SYSTEMS OF EQUATIONS IN TWO VARIABLES. Please show me how to solve this equation graphically, classify the system as consistent or inconsistent and classify the equation as dependent or independent? Thanks in advance. f(x)=x+1, g(x)= 2/3x I think I am allowing the fraction to throw me off!
Click here to see answer by longjonsilver(2297)

Question 12313: What does the word "identify" mean in algebra?
Click here to see answer by rapaljer(4671)

Question 12503: the question says solve the following system of euqations by elimination.
x+2z =5
-4x+6y =0
x-2z=9
this is the order that the problem is set up, and i haven't seen anything like this, so i need a little help on what to do.
thanks matt
Click here to see answer by Earlsdon(6294)

Question 12587: I was going along just fine doing Systems of Linear Equations and inequalities by the addition method. All of a sudden I had fractions and I am so confused, I have come up with the answers for a few of them, I don't know how, I just kept trying different things to multiply them by, but there has got to be something I am doing wrong. It is taking me 4 hours to do 20 problems and a whole sheet of paper just to answer 3 problems. Here is one I got to and completely went, HUH!!
2x/5 - y/2=13/2
3x/4 - y/5=17/2
Now, If i remember right, my instructor said that you wanted to find a number to multiply these all by, and to find a number that all 3 denominators would go into. So I used 10 for the 1st one. This is how I did it.
(10)2x/5 - (10)y/2=(10)13/2, and my answer for that one is
4x+5y=65, I don't know if this is right, or if it is, what to do next. Please Help!!!!!!!!!! Thank you!
Click here to see answer by Earlsdon(6294)

Question 12580: I don't get qestion number 19 page 134 of algebra 1
Click here to see answer by rapaljer(4671)

Question 12621: hi i have a question that reads 81+17x=30 and i have an answere of -3 can you tell me how to arrive at this answere as i can only get -2.133 thanx......
Click here to see answer by askmemath(368)

Question 12667: my name is alexis and I am having troubles with my homework on problem solving such as 16- J= 12, what is the value of J? Our teacher taught us to make a positive 16 which crosses out the other 16 but = 28 when added to 12. Of course 4 is the answer, but how do I get to this answer on this specific problem. an example of what i'm doing is; s-38=57
38 38
------
0-95
s=95

Click here to see answer by elima(1433)

Question 12840: I am an older student in Algebra and it is sooooooo confusing. I am having trouble with order of operations. Can you help me with this problem?:
7(3x-2)+5=6(2x-1)+24
this is what I have tried:
21x-14+5=12x-6+24
21x-9=12x+18
9x=-9+18
9x=9
x=1
But it's not right when I check it-but I may be doing that wrong also. Thank you for any help!
Click here to see answer by elima(1433)

Question 12852: Hi Tutors:
I used the substitution method to solve this system of equation:
m-2n=16
4m+n=1
After going through all the steps my answer is n=-7 and m=30
My problem is I did not get the correct answers when I did a check. Please help me.
SAN ANTONIO is not "hot and dusty, it is hot and humid"
Click here to see answer by longjonsilver(2297)

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