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

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

Question 395720: Write the expression for the cube of the difference of a number and 43.
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Question 395755: if angela's age is decreased by 9 and the diffrence is doubled the rsult is the same as 7 more than her age. how old is anglea?
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Question 395760: how do you solve mutiplying substitutions with addition

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Question 395763: An appliance repairman charges a flat fee of $35 plus $28 for every hour worked. If the total bill for fixing a washing machine was $133 how many did the repairman take to fix the machine?
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Question 395769: If Angela's age is decreased by 9 and the difference is doubled the result is the same as 7 more than her age. How old is Anglea?
Click here to see answer by ewatrrr(10682)

Question 395786: How do u solve for x: 2x+5y=10
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Question 395801: please help me solve this 30m-3=20m+3
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Question 395791: How do u solve for x: 3(2x+4)=2+6x+10

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Question 395883: Not sure if this is the right section, but Im having trouble with problems such as , solve for x.
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Question 395935: This tells you how dumb I am: My son has a math problem...He is in 4th grade.
If says Write the expression. Let P stand for the number of pencils jody has.
1. 3 fewer pencils than Jody has 3-P
2. Half as many pencils as jody has. Ok i am lost. please help me.
Click here to see answer by mananth(12270)

Question 395982: 9r/(5-r)=95 I need to solve for r
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Question 395971: what is a/7-5/7=6/7
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Question 395987: 9p=64p-(5/3)
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Question 395984: q/h=r/4
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Question 395988: 33+o=(9o+5)/8
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Question 395998: Plant food C is sprinkled around the base of the plant once every "d" days. Write an algebraic expression that represents the number of times per year plant food C is used.
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Question 396105: 9x/(5-x)=76
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Question 396102: d=m/v I need to solve for m
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Question 396154: i need to use the substitution method to find the variables x,y, and z in the equations 3x+2y-4z=20 ; 2x-y+3z=-5 ; and x+y+z=3.
( i solved for y, using the 3rd equation, to form the two new equations of 5x-2z=26 and x=z-8)
i dont know what to do next. please help! i would greatly appreciate it
Click here to see answer by Edwin McCravy(8909)

Question 396322: 5x2+3x-2+(6x2-4)
the x2, the 2 is a squared
it is simplifying expressions
Click here to see answer by rfer(12662)

Question 396436: ACTUAL PROBLEM
3x+2y=0
9x-24=2y
WHAT I HAVE TRIED
-9x+2y=24
Multiplied equation by -1
-3x-2y=0
-12x=24
x=2
could u please explain
Click here to see answer by rfer(12662)

Question 396505: Trail Snax Corp. mixes raisins that cost $5.00 per kg with peanuts that cost $3.80 a kg. How many kilograms of raisins should be mixed with 10kg of peanuts to obtain a mixture worth $4.00 per kg?
Click here to see answer by stanbon(57361)

Question 396962: What is the equation of the horizontal line that has a y-intercept of −4
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Question 396960: I am trying to help my son with this problem and I can't figure out where to begin on this one. I was fine until fractions came into play
2/3 +13y+1/4=2
Should he add the fractions first and then take next steps?
Click here to see answer by scott8148(6628)

Question 397209: what is the solution to this equation y=5x-2
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Question 397306: e=mc2 Solving for m
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Question 397314: 1/4+y=4
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Question 397305: (25/4)+(12/3h)=20
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Question 397613: Joy lives 466 miles from Max. At 8a.m., Joy starts driving toward Max's home at 60 mph. At 9a.m., Max starts driving toward Joy's home at 56 mph. How many miles will Joy have driven when they meet each other?
Click here to see answer by robertb(4012)

Question 397642: 8. Write the expression using exponents. Do not solve.
b ∙ b ∙ b ∙ b ∙ b ∙ b ∙ b

Click here to see answer by Edwin McCravy(8909)

Question 397642: 8. Write the expression using exponents. Do not solve.
b ∙ b ∙ b ∙ b ∙ b ∙ b ∙ b

Click here to see answer by richard1234(5390)

Question 397674: if y varies inversly to x and y is 6 when x=56 what is x when y =24
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Question 397609: x-2y+10=0 and 5x+4y+8=0
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Question 397724: Please help me solve this practice test question:
If ab=10, and a-squared + b-squared = 30, solve for y in the equation, y=(a+b)squared. Can you explain it also? Many thanks!
a. 40
b. 45
c. 50
d. 55
Click here to see answer by richard1234(5390)

Question 397595: Anton has 52 coins, some of them quarters and the rest dimes. The value of the coins is $10.00. How many coins of each type does he have?

Click here to see answer by scott8148(6628)

Question 397962: 2. Solve the system by substitution.
6x - 5y = 11
7x + 5y = 2
(1, -2)
(1, -1)
(2, -1)
(2, -2)

3. Solve the system by substitution.
x - y = -11
x + 3y = 5
(-7, 4)
(-8, 4)
(-7, 5)
(-8, 5)

4. Solve the system using elimination by addition.
x + y + z = 0
-x + y - 2z = 6
2x + y + z = 0
(1, 1, -1)
(0, 2, -1)
(0, 2, -2)
No solution

5. Solve the system using elimination by addition.
2x + 2y + 3z = 23
2x + 2y + 5z = 33
-4x - 4y - 8z = -55
(0, 4, 5)
(0, 3, 6)
(0, 5, 4)
No solution

6. Solve the system using elimination by addition.
4x - 2y + 2z = 2
-x + y - 3z = -4
4x - 3y + 7z = 9
a.(-1, -7, 0)
b.(3, 3, 2)
c. {(2s – 3, 5s – 7, s) | s is any real number}
d. No solution
Click here to see answer by solver91311(16897)

Question 398182: Barry us paid double-time for each hour over 40. Last week he worked 47 hour and earned 486, what is his hourly rate
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Question 398169: There are 160 students. 65 of them are doing math and 45 of them are dong science.
How many of them could be taking both subjects?
what is the least amount of students taking both?
what is the greatest amount of students taking both?
How many students could be taking neither subject?
Click here to see answer by robertb(4012)

Question 398511: Please help me solve the system of substitution {3x-2y=7;x+3y=-7
Click here to see answer by MathLover1(6634)

Question 398773: I want to check my answer to this problem
xy^-1 - 4x^-1
__________________
(x^2 -xy - 12y^2) x^-2 y^-2

Click here to see answer by mananth(12270)

Question 398835: I need your help to find the equation to 0.5 million bikes per year

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Question 398978: algebra varibles give threepossible values of n numbers are 9,n 16,n 20,n how do i find how to do this? please help thanks
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Question 399124: why is the symbol x avoided in algebra?
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Question 399119: V = h/e v - E/e, for e
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