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 27344: h=p didved by n;p
Click here to see answer by JC(2)

Question 27338: 2/m=m/5m+12 Please show how this is done
Click here to see answer by whty89(20)

Question 27356: please help me solve this..i've been working on it for half an hour!
at an ice cream parlor, ice cream cones are $ 1.10 and sundaes are $2.35. one day, the receipts for a total of 172 cones and sundaes were $294.20. how many cones were sold?
thanks so much!!
Click here to see answer by Paul(988)

Question 27383: i cant seem to get this right and im dead meat if its not dun by tommaro :-(
please help guyz???
thanx a bajillion!
-5(4-1/2n)+1/16(-32n+8)
simplify... if i could have it in steps that'd be totally awsome!
you rock!
Click here to see answer by Eric Johnston(7)

Question 27421: {y=2x-6
{2x+y=6
Click here to see answer by mbarugel(146)

Question 27454: How do I create an eqation using the y=MX+B formula when the problem has two slopes?
Click here to see answer by shafkat_alam(3)

Question 27457: how do i do substitution on this problem 2x+3y=4, 3x+5y=7 ?
Click here to see answer by prabhjyot(164)

Question 27560: (((-17-1+26-38=-3-m-8+2m)))
Please help me solve this problem
I got:
-17-1+26-38 = -30
-3-m-8+2m=
-11+1m=
This is where I'm totally lost...

Click here to see answer by longjonsilver(2297)

Question 27588: solve the system by addition
5x-3y=13 4x-3y=11
Click here to see answer by askmemath(368)

Question 27591: system by substitution
x+3y=13
3x+5y=19
i can't seem to get this.....
Click here to see answer by MOD(6)

Question 27638: Find three consecutive positve even integers such that the difference in the
squares of the first and third is 80
We have figured out x but I can't write the equation correctly
Click here to see answer by Paul(988)

Question 27637: One positive number is 3 more than another.
The sum of their squares is 149 Find both numbers.
We have tried x=1st number
and x +3 = 2nd number
I have figured that x=7 but I cannot get formula written
Thanks
Click here to see answer by askmemath(368)

Question 27645: (.2x-3)^2-1=x
Click here to see answer by askmemath(368)

Question 27654: solve by using the best method for each system.
3x-3y=18 and
x+y=3
Click here to see answer by askmemath(368)

Question 27660: solve by using the best method.
6x-2y=6 and
y=3x+2
This is my work.
6x-2y=6 y=3x+2 i plugged in the y=3x+2 and got 6x-6x-4=6 then I combined like terms and got x=10 and y=32.
Click here to see answer by Earlsdon(4898)

Question 27698: F{x}=2x squared
when x equals -3
find f{-3}
Click here to see answer by sdmmadam@yahoo.com(530)

Question 27792: 4(y+4)+8y=-20
Click here to see answer by prabhjyot(164)

Question 27857: The manager of a ski resort is working on two special packages. Plan A would give one person 4 nights lodging and 3 dinners for at most $320. Plan B would give one person 5 nights lodging and 4 dinners for at most $406. What is the most one dinner could cost?
A) $62
B) $45.71
C) $45.11
D) $24
I cant figure out how to break this down? THANKS SO MUCH!
Click here to see answer by Paul(988)

Question 27859: For a school fund raiser, Jay sold 12 boxes of stationary adn 8 boxes of envelopes, for a total of $41.00. Sue sold 18 boxes of stationary and 16 boxes of envelopes, for a total of $68.50. How much did one box of envelopes cost?
Any help with this would be greatly appreciated!
Click here to see answer by Paul(988)

Question 28021: x^-2-64y^-2
___________
9y-72x
i'm having trouble with this one.
Click here to see answer by sdmmadam@yahoo.com(530)

Question 28009: HELP! SHOW ME HOW

5(2X-3)+8=9
Click here to see answer by longjonsilver(2297)

Question 28172: 2n -11 > 3n + 5
Click here to see answer by sdmmadam@yahoo.com(530)

Question 28287: Four Times the larger of two numbers is equal to seven times the smaller. The sum of the numbers is 22. Find the numbers.
Click here to see answer by josmiceli(3003)

Question 28397: what happens when you have an untrue statement?
ex. 610-0m=597
the original statements were;
2n+4m=244
5n+10m=597
if you do it by elimination then both sides of the equation are the same...
I forget what this means!
Click here to see answer by mohit12(1)

Question 28354:
hey my name is jhon and i want to know how to solve solving sysytem sbstution
Click here to see answer by elima(1433)

Question 28413: 4-7x=1-6x

thanks
Creig
Click here to see answer by sdmmadam@yahoo.com(530)

Question 28404: I need HELP!
I have a word problem, and i think i set it up right, but i dont think i solved it right, i got a negative speed?!?
Here is the problem: An airplane flew for 7 hours with a tail wind of 60 mph. The return flight against the same wind took 9 hours. Find the speed of the plane in still air.
this is how i set it up, please dont laugh:
(x-60)7=9(x+60)
then i distributed:
7x-420=9x+540
then put the variables on the same side:
7x-420=9x+540
-9x -9x
---------------
the 9x's cancel out, so it becomes:
-2x-420=540
then i get the "un"variables together, so it becomes:
-2x-420=540
+420+420
-------------
then the 420's cancel out, so it becomes:
-2x=960
then get the variable by itself by dividing:
-2x=960 or -2x/2 = 960/2
which then equals:
x=480 mph
now see this time i got something different, the 1st time i got -60 mph! PLEASE HELP0 ME!
Click here to see answer by venugopalramana(3286)

Question 28508: ♥What is the difference between an expression and an equation?♥?!?
♥Jenna♥
Click here to see answer by LilSkittleMd(119)

Question 28520: By what number can each side of 1/3-4x=2/9+7 be mulitplied to clear all fractions?
A) 6
B) 3
C) 12
D) 9
When I substitute these numbers in for x the fractions dont seem to clear?
Click here to see answer by Earlsdon(4898)

Question 28535: {54b4x4/16bx2}1/3
the 4 in b and x are to the 4th power and 1/3 is on the outside of the parenthesis.
Click here to see answer by sdmmadam@yahoo.com(530)

Question 28587: how do i simplify equations and clear this of fractons
x/2+y/3=7
x/4+2y/3=8
Click here to see answer by sdmmadam@yahoo.com(530)

Question 28660: The expression 5x^6y^2/x^8y is equivalent to
1)5x^2y
2)5x^14y^3
3)5y/x^2
4)5y^3/x^14
Click here to see answer by longjonsilver(2297)

Question 28604: How many solutions does 2j+4=2j-5 have?
I wanted to say it has no solution? Is that right?
Click here to see answer by longjonsilver(2297)

Question 28609: 1 1/2y - 2 1/2y =
Click here to see answer by elima(1433)

Question 28690: 4X+7Y=32
4X+2Y=64
Click here to see answer by glabow(165)

Question 28662: I'm in the 8th grade and I don't understand the following problem:
Determine all the values of x and y such that xy, x/y and x-y are all equal.
I know that x and y can not equal zero.
Thanks you for your help.
Click here to see answer by venugopalramana(3286)

Question 28813: What is the value of the discriminant of x^2-5x-14=0?
A) 81
B) 31
C) -31
D) -81
I am not sure where to start on this? Can someone give me some direction? THANK YOU!
Click here to see answer by stanbon(26259)

Question 28873: Find the solution for this equation.
4zsquared=9
Click here to see answer by elima(1433)

Question 29026: If a tub contains 50 lb. of a 5% solution of brine, how much water must evaporate to change it to an 8% solution?
I cannot figure out how to solve this problem
I would TREMENDOUSLY appreciate your help!!!
Click here to see answer by Paul(988)

Question 29031: I am having trouble with 3 equations, Thanks!
1. 6 - 3x + 12 = 0
2. -7 + 5x = 10x - 2
3. 6y - 2 + 2y = 14
I know this is a lot but please help me, i just want to understand how it is done... im homeschooled and the books are not helping!
Thanks!
Jeff.
Click here to see answer by sdmmadam@yahoo.com(530)

Question 29030: I am having trouble with 2 equations, Thanks!
1. 6 - 3x + 12 = 0
2. -7 + 5x = 10x - 2
3. 6y - 2 + 2y = 14
I know this is a lot but please help me, i just want to understand how it is done... im homeschooled and the books are not helping!
Thanks!
Jeff.
Click here to see answer by sdmmadam@yahoo.com(530)

Question 29069: A piece of wire 42 centimeters long is bent into the shape of a rectangle whose width is twice its length. Find the dimensions of the rectangle.
Click here to see answer by sdmmadam@yahoo.com(530)

Question 29210: Write the following phrase using symbols. Use the variable x to represent the number.
Eight less than three times a number

Click here to see answer by Earlsdon(4898)

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