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

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Question 169735: Solve this equation: (I am checking my homework to see if i got it right)
4[3-3(x+1)]+1=2(-31-x)2x+31
Here's my work/answer:
12-12x-12+1=-62-2x+2x+31
-12x+1=-50-2x+2x=31
-12x+1=-50-2x+2x+19
-12x=-50-2x+2x+18
-12x=-32
x= 2 2/3
Click here to see answer by Alan3354(31487)

Question 169737: Solve equation: (please check to see if my answer is right- thank you so much!)
21=(4-5x)-(1-x)=4x-2(x-3)
Here is my work/answer:
21+4-5x-1-x=4x-2x+6
4-5x-1=5x-2x+27
-1=-2x+31
30=-2x
x=-15
Click here to see answer by checkley77(12569)

Question 169773: (7x/4)-[(6x-(1)]/2)=(3/4)
The fractions really mess me up. I am sorry but my work makes no sense so I will just leave it off.
Click here to see answer by solver91311(17059)

Question 169770: Problem:
Suppose $8,000 is invested at interest rate k, compounded continuously, and grows to $11,466.64 in 6 years.

a) Find the interest rate
b) Find the exponential growth function
c) Find the balance after 10 years
d) Find the doubling time.
Thank you.

Click here to see answer by Edwin McCravy(8999)

Question 169896: how do you solve linear equaions with the subsitution method?
Click here to see answer by nerdybill(7003)

Question 169896: how do you solve linear equaions with the subsitution method?
Click here to see answer by Alan3354(31487)

Question 169975: I really need help solving the following problem. Any assistance you can provide me in doing so will be greatly appreciated. Thanks!
One number is 6 less than another. The product of the number is 72. Find the numbers.
Click here to see answer by jim_thompson5910(28696)

Question 169981: Hi, Can you please help?
.
Can you please give me some math problems for my homework?
I need to solve systems of equations
.
Can you please give some systems of equations that I could solve?
.
Keep in mind that I have to solve these equations with both the substitution, and elimination method
.
I would like some easy problems ( with answers with whole numbers, like ( 4,5 ) and ( -1, 8 ) )
.
I would like some medium problems ( with answers with nice fractions such as ( 1/2, - 3/4 ) and ( 2/5, 1/10 )
.
I would like hard problems ( with answers with fractions like ( 43/99, 44/199) and ( - 309/299, 87/77 )
.
I need to at least have 20 - 30 problems. So I need at least 20 people to submit one, or ten submit two, and so forth, ( or if one person could send a lot of them)
.
It doesn't matter if I get 1000(exaggeration) problems, I just need a good number of them.
.
Please send me the answers to my email at Electrified_Levi@yahoo.com
.
Also, if some can give some easy 3 variable equations with whole numbers, or even medium difficulty
.
Thanks

Click here to see answer by jim_thompson5910(28696)

Question 170001: This is a systems of equations question.
If the equation is:
2x+6=y
3x+4y=24
__________
Please solve by substitution, elimination, AND graphing. ( the same equation)
Thank you so very much.
Click here to see answer by jim_thompson5910(28696)

Question 170032: Hi, Can you please help?
.
When given the system of equations of

.
If you are solving it using elimination
.
This is how I would solve it
.
I would multiply the whole second equation by
.
= =
.
I would then add this equation with the first equation
.

.
I would then come up with , then I solve it, and find that "x" = 2, then I would plug in the answer, and find that "y" = (-1)
.
Is this how elimination works?
.
Or do you have to do it this way...
.

.
Multiply the first equation by "7" and the second by "5"
.
I did the math and came up with
.

.
Then add the equations
.
I get , and then find "x" is "2", and "y" = (-1)
.
I will be doing quizzes soon, and I perfer the first way, but does elimination mean you do it the second way
.
What I am asking is, is it o.k. to do elimination the first way, or is the second way, the right way to do it?
.
Thanks ahead of time, Levi
Click here to see answer by checkley77(12569)

Question 170175: Tyler said, "the sum of two numbers is 180 and twice the first number increased by forty is equal to to twice the second number." Help Tyler find the numbers.
Click here to see answer by jim_thompson5910(28696)

Question 170179: Solve the system of equations using the substitution method. If the answer is a unique solution,present it as an ordered pair (x,y). If not specify whether the answer is "no solution" or infintely many solutions."
3x+y=7
4x-y=21
Second part of question.
Solve the system of equations using the addition (elimination) method. If the answer is a unique solution, present it as an ordered pair: (x,y). If not specify whether the answer is "no solution" or infintely many solutions.
6x+2y=2
3x+5y=5
Third Part
Solve the system of equations using the addition (elimination) method. If the answer is a unique solution, present it as an ordered pair:(x,y). If not, specify whether the answer is no solution or "infinitely many solutions."
4x-3y=1
-12x+9y=5
Click here to see answer by jim_thompson5910(28696)

Question 170387: Please help me solve this prolem. I just don't get it if there are not numbers.
Solve for P: A=P+Pr
Click here to see answer by checkley77(12569)

Question 170598: I am so confused by this. My mom tried to help me but she doesn't understand either. There is one of the questions I am supposed to solve. If someone can show me the steps to this one maybe I can figure out the others.
Maria has $7.30 in dimes and quarters. She has 34 coins. How many dimes could she possibly have? Explain your answer. Don't forget to show your work!
(Hint: The problem could be solved using a linear system of equations. Try to set up an equation indicating the number of coins and another equation with their value.)

Click here to see answer by Mathtut(3670)

Question 170643: X=4y+8
2x-8y=-3
Click here to see answer by checkley77(12569)

Question 170659: Solve by the substitution method
x + y = 2
x + y = -9
Click here to see answer by jim_thompson5910(28696)

Question 170689: Larry can paint a room in 8 hours by himself. After he worked for 2 hours, Patrick joins him and they finish the job in 2 hours. How long would it take Patrick to do the entire job without Larry?
Click here to see answer by stanbon(57940)

Question 170710: If x=3 and x= -5, then form a quadratic equation
Click here to see answer by jojo14344(1512)

Question 170730: I'm 60 years old and I decided to go back to show and this math is a little hard please please help.
Plot the graph of the equations 4x - 6y = 2 and 2x - 3y = 1 and interpret the result.

thank you in advance.

Click here to see answer by jim_thompson5910(28696)

Question 170811: y=x-5
What is the x and y intercepts
Click here to see answer by Alan3354(31487)

Question 170858: Write a Linear equation that gives total fees (t) to be paid by astudent taking (x) credits.
$20 per credit.
$50 student service fee.
Click here to see answer by Mathtut(3670)

Question 170857: Write a Linear equation that gives total fees (t) to be paid by astudent taking (x) credits.
$20 per credit.
$50 student service fee.
Click here to see answer by Mathtut(3670)

Question 170972: f(x)=x-3/x+4 the x-3 is over the x+4 What would the y and x intercepts be?
Click here to see answer by Mathtut(3670)

Question 171140: I do not understand fraction problems. Please help me with this one so I have a correct model to refer to for the rest of my worksheet. Thank you. (7x/8)- (4)= x
Click here to see answer by jojo14344(1512)

Question 171134: How do I solve: x=-2/7y+3/4? How do i find the y-intercept and x-intercept and graph y= 2x+4 / y= -2x-4?
Click here to see answer by jojo14344(1512)

Question 171244: solve by graphing
x=-1
4x+y=-2
Click here to see answer by stanbon(57940)

Question 171244: solve by graphing
x=-1
4x+y=-2
Click here to see answer by Mathtut(3670)

Question 171281: whats the steps to solving systems of equations by using elimination
Click here to see answer by solver91311(17059)

Question 171281: whats the steps to solving systems of equations by using elimination
Click here to see answer by midwood_trail(310)

Question 171363: I apologize if this is in the wrong heading. My problem is systems of linear equation by substitution. { y=4x { y=2x+6
I am not sure how to do this problem. I tried getting the numbers to match up so i could figure it out, but i cant seem to grasp it. Sorry if you cannot solve this problem and i'm sorry for wasting your time, but i am about ready to give up. This is a worksheet, and not from a book, by the way.

Click here to see answer by Alan3354(31487)

Question 171527: Given y=1/2x-1, which of the following tables of value are correct?
Table A
x,y
2,0
0,-1
-2,-2
Table B
x,y
5,2
2,0
-5,-2
Table C
x,y
6,3
7,2
-8,-3
Table D
x,y
1,1
-1/2, -1/2
-1,-1

Click here to see answer by KnightOwlTutor(293)

Question 170304: Solve the system of linear equations. Determine whether the system is consistent or inconsistent.
2x + 8y + 3z= -4
-4x - 16y - 6z = 8
3x + 4y - 3z = 2
Click here to see answer by Alan3354(31487)

Question 171749: 3x - y = 0
5y = 15
Click here to see answer by Alan3354(31487)

Question 171748: 3x - y = 10
x - 3y = 11
Click here to see answer by Alan3354(31487)

Question 171805: How to write an equation in standard form using integers
Click here to see answer by jim_thompson5910(28696)

Question 172348: 1 times a number plus -5 that will give me an answer of -3
Click here to see answer by Mathtut(3670)

Question 172386: solve for x
2^(x+4)=8
Click here to see answer by user_dude2008(1861)

Question 172383: solve for x
2^(x=4)=8
Click here to see answer by Alan3354(31487)

Question 172445: I need help solving a substitution problom
-3x+y=-3
2x-5y=-11
Click here to see answer by jim_thompson5910(28696)

Question 172444: I need help solving a substitution problom
-3x+y=-3
2x-5y=-11
Click here to see answer by checkley77(12569)

Question 172451: I need help solving a substitution problom
1/2x+y=2
2x+3y=9
Click here to see answer by stanbon(57940)

Question 172451: I need help solving a substitution problom
1/2x+y=2
2x+3y=9
Click here to see answer by Alan3354(31487)

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