Questions on Algebra: Expressions involving variables, substitution answered by real tutors!

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Algebra: Expressions involving variables, substitution

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Question 48261: how is this problem solved? I do not understand.
6x+1x^2=27
Thanks!
Click here to see answer by Earlsdon(4898)

Question 48381: I am trying to solve this equation: 19 - 3n = negative 2n. I do not understand the steps needed to solve this problem.
Thank You,
Click here to see answer by checkley71(8405)

Question 48702: Solve by substitution.
x - y = 3
3x - 2y = 3
Click here to see answer by dead_famous1991(7)

Question 48714: 2x+3+5x
=7x+3

Click here to see answer by dead_famous1991(7)

Question 48703: Solve by substitution.
3y = x + 5
3x - 9y = -10
3y = x + 5
3x - 9y = -10
=> -9y = -10 -3x
=> -9(x + 5) = -10 - 3x
=> -9x - 45 = -10 - 3x
=> -45 + 10 = -3x + 9x
=> -35 = 6x
=> -35/6 = x
3y = x + 5
=> 3y = -35/6 + 5
=> 3y = -35/6 +30/6
=> 3y = -5/6
=> y = -15/6
Click here to see answer by dead_famous1991(7)

Question 48713: How do you solve: (x+3)-(x+7)?
Click here to see answer by checkley71(8405)

Question 48697: Subtract
p - 5 from 3p - 6
Thanks alot!
Click here to see answer by checkley71(8405)

Question 48675This question is from textbook
: y+8This question is from textbook

Click here to see answer by tutorcecilia(2042)

Question 48728This question is from textbook Study Guide & Practice Workbook
: Define a variable and write an algebraic equation for the total amount of money
in a bank containing only dimes.This question is from textbook Study Guide & Practice Workbook

Click here to see answer by stanbon(26259)

Question 48742: where do i start with this equation:
3m-n=-8
m+2n=9

Click here to see answer by checkley71(8405)

Question 48789: Solve by substitution.
x = y + 3 and 3x - 2y = 4
Click here to see answer by checkley71(8405)

Question 48786: Solve by substitution.

x = 1/8y - 1
y = 1/4x + 39

Click here to see answer by checkley71(8405)

Question 48852: I am heading back to college and I am preparing for compass test. Needing help with sample question please... Question is... If x = -1 and y = 2, what is the value of the expression 2x^3 - 3xy? My answer choices are (a) 8 (b) 4 (c) -1 (d) -4 (e) -8 I am terrible at math, especially algebra, if you can explain this I would greatly appreciate it. Also, if you know of a website that I could study on I would appreciate that information. Have a Great Day - Krystal
Click here to see answer by Nate(3495)

Question 49043: I cannot figure out how to set this problem up, can you help me?
Click here to see answer by ccstarburstlover(3)

Question 49072: I have a word problem that is throwing me off:
THE SUM OF TWO NUMBERS IS 18. THREE TIMES THE GREATER NUMBER EXCEEDS FOUR TIMES THE SMALLER NUMBER BY 5. FIND THE NUMBERS.
I know the first sentence is: x + y = 18 but how do I know which number is greater and which one is smaller? If I could just set up the equation I could solve it but I don't know how to set the equation up.
Thank you for your time.
Click here to see answer by atif.muhammad(135)

Question 49080: 10-3(5-2)
Click here to see answer by checkley71(8405)

Question 49081: 15+5[5+3(8/4+2)]
_________________

7-45/[5+2(6/3)]
Click here to see answer by checkley71(8405)

Question 49128: Is this the proper way to word these two problems ???
3-(2+3x)
Answer Choices:
A: 1-3x
B: 1+3x<--- This was my son and his tutor's choice
C: 5+3x

8d-(4d+2)
Answer Choices:
A:4d+2<--- This was my son and his tutor's choice.
B:4d-2
C:2d
My son is working on an Internet course from BYU (Brigham Young University). The instructor says that my sons choices were wrong. I believe that BYU is wrong, can you please clarify BYU's reasoning???

Signed, concerned Dad
Click here to see answer by venugopalramana(3286)

Question 49200This question is from textbook beginning algebra

: i do not understand 9-(-2)(-7)This question is from textbook beginning algebra

Click here to see answer by longjonsilver(2297)

Question 49224: How do you solve this expression:
3x^2-5x+2 can be factor as 3(x+p)^2=q
Click here to see answer by AnlytcPhil(958)

Question 49226: 2.7+3.6*4.5
Click here to see answer by tutorcecilia(2042)

Question 49295: if ax²+bx+c=0, where a, b, and c are integers and its two solutions have to be rational numbers, then b^2-4ac=?

Click here to see answer by AnlytcPhil(958)

Question 49316: Solve the system by substitution.
x + y = 12
y = 2x
Need help someone
Click here to see answer by Earlsdon(4898)

Question 49267: (6a-54)-(5a+27)=23
Click here to see answer by checkley71(8405)

Question 49317This question is from textbook
: what property is this?
-(ab)= -a . b= a . (-b) its opposite of a what? thats what the question says.
ps .=multiplicationThis question is from textbook

Click here to see answer by jake_6233(74)

Question 49005: A rectangular lawn is 24 feet wide by 32 feet long. A sidewalk will be built along the inside edges of all four sides. The remaining lawn will have an area of 425 square feet. How wide will the walk be? Please solve and explain.
Click here to see answer by Earlsdon(4898)

Question 49384: 10 - 3 - [ 11 - (-4)]
Click here to see answer by checkley71(8405)

Question 49383: -9 + 12 -7 - 2 + 13
Click here to see answer by checkley71(8405)

Question 49382: - 3 + ( 5-9 )
Click here to see answer by checkley71(8405)

Question 49406: a plane takes 6 hours to fly from san francisco to new york, and 5 hours to return back. the airplane's airspeed is 550 miles per hour, from new york to san francisco. the reason why it takes the airplane longer to go west than east is because of a wind with constant wind speed. what is the speed of wind?
Click here to see answer by checkley71(8405)

Question 49381: - 14 - 6 + 8 + 13
Click here to see answer by checkley71(8405)

Question 49500This question is from textbook Prealgebra and Introductory Algebra
: 14-6a = 2a+3
How do you solve this step by step?This question is from textbook Prealgebra and Introductory Algebra

Click here to see answer by checkley71(8405)

Question 49595: We are soing an Alg. 1 review to start off Alg. 2 and after 2 years i forgot almost everything about algebra. Our teacher wants us to "Use elimination to solve"
5x+2y=5
3x+y=2
Click here to see answer by Earlsdon(4898)

Question 49594: I need help in substituting this problem! please help!
x-y=4
x-2y=10
I'm really sorry if you don't understand what i need it is all my teacher gave me with the instructions "Use substitution to solve" seriously.
Thank you so much!
Click here to see answer by stanbon(26259)

Question 49623: Hi! How do you factor completely: 6x^2-5y-3xy+10x. I would show you work but I forgot how to do this kind of problem. Could you please tell me how to solve it using a couple different methods? Thanks!
*anonymous*
Click here to see answer by Earlsdon(4898)

Question 49621: Hi! Thanks for the service. How do you solve this question:Which of the following is a factor of: 6x^2-23x-4
A. (3x-2)
B. (3x+2)
C. (2x+1)
D. (6x+1)
E. (6x-1)
I would show you my work but I honestly have NO clue what to do. : ) Thank you once again!
*anonymous*
Click here to see answer by checkley71(8405)

Question 49501: Looking for variable pattern:
X Y
0 75
1 150
2 300
3 ?
4 ?

Click here to see answer by Juhi(44)

Question 49510: Looking for variable expression for:
years------gallons
_______________________
0----------1024
5----------256
10---------64
15---------?
20---------?
Click here to see answer by Juhi(44)

Question 49509: Looking for variable expression for:
x-------y
___________
1-------3
2-------9
3-------15
4-------?
5-------?
Click here to see answer by Juhi(44)

Question 49508: Looking for variable expression for:
input output
_________________
1-------3
2-------9
3-------27
4-------?
5-------?
Click here to see answer by Juhi(44)

Question 49704: solve for x: 12/21 = (x-5)/x
A 5/9
B 11 2/3
C cannot be done
Click here to see answer by pwac(251)

Question 49702: Please help!
Solve for X: 5:25=7:x
A. 17.86
B. 27
C. 35
Thank you!
Click here to see answer by checkley71(8405)

Question 49703: pleasehelp!
solve for x: 8/x = 12/(x+2)
A. 4/5
B 1/2
C 4
Thank you!
Click here to see answer by checkley71(8405)

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