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

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

Question 428942: 7x^(2)-8=-1
Click here to see answer by ankor@dixie-net.com(15623)

Question 428979: 2x + y = 7
x + 3y = 1
use substitution to solve

Click here to see answer by algebrahouse.com(1079)

Question 428981: I do not seem to understand reciprocals. I have a couple of problems as examples that I am trying to work through.
The question is: Rewrite the division as multiplication by the reciprocal. Evaluate the expressions.

3 divided by 1/4

1/3 divided by 1/4
3/4 divided by 2
3/2 divided by 3
the next couple of them I am also having problems with:
evaluate the expressions:
3/4 * 1/3
-2/5 * 3/4
7/8 * -1/4

Click here to see answer by richard1234(5390)

Question 429469: This problem is giving me trouble. I can simplify but can't figure out how to flip the bottom to cancel out.

7k - 21 7(k - 3)
-------- ----------
9 - 3k 3(3 - k)
Click here to see answer by sudhanshu_kmr(1152)

Question 429468: Having trouble with this problem
1/a + 1/b = c solve for a
Click here to see answer by edjones(7569)

Question 429586: Rewrite the expression (-5y)^-3 using positive exponents
Click here to see answer by shree840(260)

Question 429623: (A^5B^5)(a^5B^3)
Click here to see answer by ewatrrr(10682)

Question 429623: (A^5B^5)(a^5B^3)
Click here to see answer by vleith(2825)

Question 429344: Is this equation factored completely : 2(2x^2-9)

Click here to see answer by Alan3354(30955)

Question 429703: can someone help me im stuck
write each expression in lowest terms.
8. 4p2-25/5-2p
Click here to see answer by Gogonati(809)

Question 429762: what is the value of (-5) 2
Click here to see answer by stanbon(57214)

Question 429804: I feel like I've tried every possible solution and can not find the correct answer.
"Which of the following points is a solution to the system?"
5x+3y+3z=-13
8x+6y-8z=-2
3x-y-8z=-12
I know you are suppose to do the addition method but every pairing I've tried does not come out even. I'm stumped!
Click here to see answer by stanbon(57214)

Question 429942: Deanna is five more than six times older than Ted. The sum of their ages is 47. How old is Ted?
Click here to see answer by ewatrrr(10682)

Question 429942: Deanna is five more than six times older than Ted. The sum of their ages is 47. How old is Ted?
Click here to see answer by Sphinx pinastri(17)

Question 429988: Joe, Craig, and Dylan have a combined weight of 429 pounds. Craig weighs 34 pounds more than Joe. Dylan weighs 13 pounds more than Craig. How many pounds does Craig weigh?
Click here to see answer by ewatrrr(10682)

Question 430094: What is the solution to 5x+7y=-23 and -3x+y=19. (type an ordered pair)substitution method or elimination?? repost if this is not what you inquired...be more specific please.
Click here to see answer by haileytucki(390)

Question 430110: Hello there. Thank yall for all that you do. I am having a little difficulty with these three problems. Any asistance would be greatly appreciated. Thank you for your time.

using the substitution method
9m+n=10 and m-5n=42
8x-7y=-41 and 4x+43=y
5x+6y=-29 and -8+y=57
(type an ordered pair)
Click here to see answer by haileytucki(390)

Question 430033: Simplify the expression and write the answer in fraction form:
(1)/(2*3)+(1)/(3*4)+(1)/(4*5)+.......+(1)/(50*51)

Thank you!
Click here to see answer by sudhanshu_kmr(1152)

Question 430175: The area of a rectangle is 45 square cm. If the length is 4 cm greater than the width, what are the dimension of the rectangle?
Click here to see answer by algebrahouse.com(1079)

Question 430552: My school wants me to simplify the expression. But I'm not sure how to I keep trying but I keep getting the wrong answer. Is there any way that you can show me in steps and explain it to so that i can learn this to complete my quiz?
-4x - 4y
________
x + y =
Click here to see answer by sudhanshu_kmr(1152)

Question 430906: (xy)3 power =xy3 is this correct and if so how
Click here to see answer by stanbon(57214)

Question 431197: solvinng system of equation three variables
6x-y+z=2
4x+2y-3z=18
x-3y+2z=-5
Click here to see answer by mananth(12270)

Question 431199: solvinng system of equation using three variables
6x-y+z=2
4x+2y-3z=18
x-3y+2z=-5
Click here to see answer by mananth(12270)

Question 431286: 9=2s+1
Click here to see answer by rfer(12644)

Question 431479: Find all the factors of 42. Please show all of your work.
Click here to see answer by Alan3354(30955)

Question 431479: Find all the factors of 42. Please show all of your work.
Click here to see answer by josmiceli(9647)

Question 431480: Classify the number as prime, composite, or neither.
2

Click here to see answer by rfer(12644)

Question 431478: Use the distributive property to multiply.
4(a + b)

Click here to see answer by rfer(12644)

Question 431477: Use the associative property of multiplication to write an equivalent expression.
9(ab)

Click here to see answer by rfer(12644)

Question 431476: Use the commutative law of addition to write an equivalent expression.
f + 6g

Click here to see answer by richard1234(5390)

Question 431628: pleassse help :(
divide. write the answer in lowest terms.
c2+4c/c2-c-20 divided by c/c-5

Click here to see answer by ankor@dixie-net.com(15623)

Question 431710: 5/6*18/25
Click here to see answer by rfer(12644)

Question 431686: How would I write an equation to show that 16x-8 and 14x-2 are the same, and how would i solve for x?
Click here to see answer by rfer(12644)

Question 431653: please help
multiply.write the answer in lowest terms.
9mn4/8m2n times 20m3/3n3

Click here to see answer by rfer(12644)

Question 431964: Translate the following sentence into an equation. Do not solve.
“Triple the difference of a number and fourteen is 60.”

Click here to see answer by ewatrrr(10682)

Question 431964: Translate the following sentence into an equation. Do not solve.
“Triple the difference of a number and fourteen is 60.”

Click here to see answer by Alan3354(30955)

Question 431968: Use the distributive law to multiply.
7(2x + 5y + 8)

Click here to see answer by ewatrrr(10682)

Question 432241: which expression represents two more than twice a number?
Click here to see answer by algebrahouse.com(1079)

Question 432367: 3(x+2)+7x
Click here to see answer by rapaljer(4667)

Question 432371: Hello there. Please help me. The topic bar is messed up on my computer. It runs off the page and I cant see what is selected. Thank you
-6
Click here to see answer by rapaljer(4667)

Question 432368: Hello there. I had three problems I can not get. Please help me. The topic bar is messed up on my computer. It runs off the page and I cant see what is selected. Thank you
-13<=3x-8<=-3 the solution is (x|_<=x<=_)

Click here to see answer by belle3833(46)

Question 432489: L=a(2b + 2ct) for c
Click here to see answer by MathLover1(6612)

Question 432598: (-5)(m)(m)(m)(n)
Click here to see answer by edjones(7569)

Question 432696: Help me solve: 12T+7=6+11
I've come up with 6t +7=11
6t/6=4/6 cant figure out from here
Click here to see answer by edjones(7569)

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