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

Tutors Answer Your Questions about Expressions-with-variables (FREE)

Question 377853: Solve using the multiplication principle first. Then use the elimination method.
2x+y=13
4x+2y=23
I'm not sure if I multiply equation #1 by -2 to eliminate x? If I do that, then I eliminate y. I'm confused, what do I multiply? Thank you.
Click here to see answer by mananth(12270)

Question 377895: Problem : 5(2q - 1) = -5 + 10q
Question : What is Q ?
Click here to see answer by nyc_function(2733)

Question 377894: Solve by rearranging the equations first. Then use the multiplication principle and then use the elimination method:
3x=8y+11
x+6y-8=0
How do I multiply each equation by to eliminate x? What do I multiply equation #1 by? I thought I should multiply equation #2 by -3 to eliminate e? I know I have to rewrite the equations too. Please help. Thanks!
Click here to see answer by stanbon(57940)

Question 377809: If 45 is added to a two-digit number, the result is a number with the same digits, but in reverse order. The sum of the digits is 11. What is the original number?

Click here to see answer by richard1234(5390)

Question 378076: Factor completely

Click here to see answer by mananth(12270)

Question 378089: Solve the equation.
x(2x-13)=15
use commas to separate answers as needed.
Click here to see answer by mananth(12270)

Question 378106: 1.how to solve C(n)= -3-6 AND C(n) =n-4
2. how to solve m=5p+8 and m=-10p+3
3. how to solve y=4x+12 1/2 and y= 1/4 x +4
4. how to solve h=6g-4 and h=g+28
5. how to solve a=2/5b-3 and 2b-18
Click here to see answer by nyc_function(2733)

Question 378527: Can someone help me with this problem please, I suck at math.
2(7y+5) - 2[(10y+1) – (2y + 5)] =

Click here to see answer by robertb(4012)

Question 378629: This is actually elimination but my question is if my problem is 2x+2/3y=4
x-1/2y=7
How can i figure it out i've tried everything but when i plug it back in it doesn't work.
Thanks
Click here to see answer by ankor@dixie-net.com(15745)

Question 378609: Instruction:Wrie the equation of the line through the given point and parallel to the given line
1.y= 3x -4 (-2,1)
Click here to see answer by Fombitz(13828)

Question 378761: The equation is:
dy/dx
What is the answer and how do you work it out?
THANK YOU SO MUCH.
Click here to see answer by jim_thompson5910(28696)

Question 378763: the question is:
-ab/(-a)
What is the answer?
And how do you work it out?
THANK YOU.
Click here to see answer by jim_thompson5910(28696)

Question 378764: The question is:
36e/24de
What is the answer?
How do you work it out?
THANK YOU.
Click here to see answer by jim_thompson5910(28696)

Question 378773: what is?
dy/dx
THANK YOU.
dy/dx is the equation.
Click here to see answer by jim_thompson5910(28696)

Question 378779: What is?
5ab+(6a*2b)
How do you do it and what is the answer?
THANK YOU.
Click here to see answer by jim_thompson5910(28696)

Question 378796: What is:
7m-(-3m)+2m
Click here to see answer by mananth(12270)

Question 378795: what is :
(a^3)^2/a^4*a^2
Click here to see answer by mananth(12270)

Question 378794: what is:
(2x)^2*(3y)^2/18xy
Click here to see answer by mananth(12270)

Question 378793: What is?
(6a^2 * 6b^2 / 9ab / 2a) ^2

THANK YOU.
Click here to see answer by mananth(12270)

Question 378784: what is?
(6a squared * 6b squared / 9ab / 2a) squared
What is the answer?
How do you work it out?
THANKS.
Click here to see answer by mananth(12270)

Question 378799: what is:
7xy^2/14xy
Click here to see answer by user_dude2008(1861)

Question 378782: what is?
5ab+(6a*2b)
THANK YOU.
Click here to see answer by mananth(12270)

Question 378881: 2 brothers bought together 15 books, one bought 7 books, how many books did the other brother buy?
Click here to see answer by ewatrrr(10682)

Question 378884: A rental car shop rents their vehicles for $50.00 per day plus $.05 per mile driven. If Sally rents the car for one day and drives a total of 90 miles, how much must she pay to the rental car shop?

Click here to see answer by ewatrrr(10682)

Question 379215: can you help me
Click here to see answer by Alan3354(31487)

Question 379234: could you explain to me how to answer questions with two variables and show the steps, such as 15-2y=3y?
Click here to see answer by Alan3354(31487)

Question 379425: can you please see if you can simplify this expression (2^3m^4n^-1/p^2)^0
Click here to see answer by tutorcecilia(2152)

Question 379425: can you please see if you can simplify this expression (2^3m^4n^-1/p^2)^0
Click here to see answer by Alan3354(31487)

Question 379541: Please help solve using the LCD to simplify complex fraction.
1/x + 1/y
---------
3/x + 3/y
Click here to see answer by mananth(12270)

Question 379612: good morning can you help me answer this problem
Assume that the probability of a customer selecting a jelly filled donut is 20%. What is the probability that the next two customers will both buy jelly filled donuts?

Click here to see answer by Fombitz(13828)

Question 379971: a= 2b-4
2b+a=2
Click here to see answer by robertb(4012)

Question 380274: What is Zx=Wx solve for x
Click here to see answer by rapaljer(4667)

Question 380357: y=-2x-15

Click here to see answer by Fombitz(13828)

Question 380378: 2) Solve the system of equations by the addition method.
x/2+y/4=2
x/4-y/8=2
Type an ordered pair if possible.
Or the other options are: There are infinitely many solutions, or there is no solution.
Click here to see answer by richard1234(5390)

Question 380396: Solve the equation for x.
6x-2=6(x-6)
Click here to see answer by Jk22(389)

Question 380594: My child's Algebra teacher uses problems of the week based on Gary Tsuruda's book "Putting It Together". This week's problem has me stumped. I am educated in math but,... The problem: A man has a bag of coins. He meets three people. The first one gets 1/2 the coins +2. The second gets 1/2 the coins +2. The third gets 1/2 the coins +2. When the man returns home he has two coins in his bag. How many did he start with? I need help with the equation. I tried working backwards, but the answer does not work in the problem. Thanks in advance for any help.
Click here to see answer by ptaylor(2052)

Question 380542: Solve by elimination:
4x+2y=6
-2x+3y=-7
Click here to see answer by Fombitz(13828)

Question 381046: h=6g-4
h=-2g+28
Click here to see answer by Fombitz(13828)

Question 381295: The sum of the angle of a triangle is 180〫. If one angle of a triangle measures x and the second angle measures (5x+18)〫, express the measure of the third angle in terms of x. Simplify the expression.
Click here to see answer by mananth(12270)

Question 381303: Solve the system of equations by the addition method.
x/4-y/12=-1
x/3+y/9=-2
Click here to see answer by mananth(12270)

Question 381308: 21)Solve the equation for x.
3/4x-1/2=-8
Type an integer or fraction. Simplify your answer.
Click here to see answer by rfer(12726)

Question 381225: Why is (5x+6)(x-4)/(2x-5)(x-4) not in factored form? What is the correct final factored form? What is this factoring method called? Also post and example using the same factored method.
Click here to see answer by richard1234(5390)

Question 381515: Hi can you please help me with These problems step by step
7x - 10 = 12
3x = 9x - 15
4( x - 9) = ( x - 5) + 9
Click here to see answer by checkley79(3056)

Question 381476: a trail mix that costs $2.45 per pound is mixed with a trail mix that costs $2.30 per pound. how much of each type of trail mix must be used to have 30 pounds of a trail mix that costs $2.35 per pound
Thanks
Click here to see answer by checkley79(3056)

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