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

Tutors Answer Your Questions about Linear-systems (FREE)

Question 8043: I know this is a simple problem but I have so much trouble understanding word problems. I need to write an algebraic expression and solve for the below word problem:
Sara earns $580 more than one half of Karen’s salary. Write an expression for Sara’s salary.
My first thoughts were that the equation would begin 1/2x + 580 =
But I am not sure. My class is online and have NO interaction with an instructor except a few emials a day. Help please..
Click here to see answer by longjonsilver(2297)

Question 8064: A number has two digits whose sum is 8. If 18 is added to the number, its digits are reversed. What is that number.Help me please.
Click here to see answer by longjonsilver(2297)

Question 8056: Numerator of a fraction is 4 less than its denominator. if 1 is added to both sides, its numerator and denomirator becomes 1/2. Find the fraction.Sir it is a question from my linear equation with one variable chapter.Kindly help me.
Click here to see answer by glabow(165)

Question 8065: How much pure alcohol must be added to 400 ml of a 15% solution to make its strength 32%
Click here to see answer by Earlsdon(6287)

Question 8210: 2(X+1)=4-3(2x+1) - what does x equal?
Click here to see answer by bonster(299)

Question 8570: How Do I graph this Linear Equation, and find it's slope? The x + y part instead of the basic mx+b confuses me
12x+4y=8
Thanks.
Click here to see answer by rapaljer(4667)

Question 8584: hOW YOU SOLVE
2X+9=5X
Click here to see answer by George(3)

Question 8735: I need to know what x is. I have been working on one problem for two hours and I can't take it anymore... I don't know what to do from here and I've searched my notes and textbook... I will paste how far I've gotten.. (not very far!) Can you tell me how it's done from here?

2) (4/5)x + 18 = 12
-18 -18
(4/5)x = -6
(4/5) (4/5)

Click here to see answer by Earlsdon(6287)

Question 8887: I need help on this equation:
y=[x+3]-4=

I need the x-intercepts(the negative and positive).....im stuck at that part..
Thanks
Click here to see answer by rapaljer(4667)

Question 9169: We need help solving the following equation:
x^2-8x=2
Thank You for your help
Click here to see answer by lucky83(12)

Question 9322: I was just wondering if there is a set method to convert the different forms of linear equations. I'm having a lot of trouble converting say the slope intercept form of the equation into the standard form. Any help converting equations into the standard form would be greatly appreciated.
Click here to see answer by rapaljer(4667)

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(4667)

Question 9302: Please help me solve this equation:2x=-x+9
Click here to see answer by rapaljer(4667)

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 9490: -(x-3)+2(x-1)<3(x+4)

Click here to see answer by prince_abubu(198)

Question 9490: -(x-3)+2(x-1)<3(x+4)

Click here to see answer by rapaljer(4667)

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(6287)

Question 9867: what is meant by find the slope in a linear equation problem?
Click here to see answer by Stxfball(4)

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 10248: 2x+3x=10

Click here to see answer by bonster(299)

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(4667)

Question 10317: I'M HAVING TROUBLE WITH THE FOLLOWING EQUATION, PLEASE HELP
1/5X + 1/6 = -2
Click here to see answer by Earlsdon(6287)

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(499)

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(4667)

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(4667)

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(4667)

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(6287)

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 10959: please help me with this question;what is 24/6+3.2/4 equals
Click here to see answer by Stxfball(4)

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(6287)

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(6287)

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