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

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

Question 480126: 3a+5b=-34
5a+b=68
a=
b=
Click here to see answer by stanbon(57203)

Question 480373: P1V1=P2V2
Solve for P1
Click here to see answer by Tatiana_Stebko(1326)

Question 480618: I don't know how to solve this literal equation, can you help me? I need to solve for x.
12ax - 36 = 6ax
Click here to see answer by stanbon(57203)

Question 480621: I also need help solving this literal equations. I need to solve for x.
cx + 4c = 5x + 7c
Click here to see answer by Edwin McCravy(8879)

Question 480944: Find an equivalent expression without parenthesis.
-(C + 48)=
Click here to see answer by ewatrrr(10682)

Question 480971: 7x-8y=40
8y-7x=40
Are these consistent,inconsistent,dependent or independent
Click here to see answer by ewatrrr(10682)

Question 480967: Please help me solve this.
4+5^2x3
Click here to see answer by Alan3354(30924)

Question 480953: Trains A and B are traveling in the same direction on parallel tracks. Train A is traveling at 40 miles per hour and train B is traveling at 60 miles per hour. Train A passes a station at 3:10 A.M. If train B passes the same station at 3:22 A.M, at what time will train B catch up to train A??
Click here to see answer by lwsshak3(6456)

Question 480145: mr.jones is 30 years older than his son. six years ago he was 7 times as old as his son was then. find their present ages.
Click here to see answer by lwsshak3(6456)

Question 480673: Please answer problem 1 graphically with complete solutions and checking:
# 1) x + y = 5
x - y = -3
Please answer problem 2 by substitution method with complete solutions and checking:
# 2) x = 3y + 4
2x – 8y – 6 = 0
Please answer problem 3 by elimination method with complete solutions and checking:
# 3) 2x + 5y = - 8
3x – y = 5
Would appreciate if you can solve it step by step for me to understand it better. Thanks in advance.
Click here to see answer by ankor@dixie-net.com(15622)

Question 480120: bob has $2.90 in pennies nickels and dimes. he has the same number of pennies and nickels. if the number of dimes is 5 more than the number of nickels, how many of each type of coin does he have?
Click here to see answer by lwsshak3(6456)

Question 477632: the math problem is ((-16 - (-2 + 1)) x 2 divided by 5 , I don't understand the double parenteses by the -16 and after the 1, I don't know how to solve it.
Click here to see answer by lwsshak3(6456)

Question 477152: Determine the value of r so that the line through (6,r) and (9,2) is perpendicular to 5x-3y-9. Please help, I don't know how to do this at all. Thanks in advance.
Click here to see answer by lwsshak3(6456)

Question 481052: Hi could you please solve- 16/ 12x- x^3 when x=3
i understand the answer should come to 25+12x, but do i just leave it like that?
Click here to see answer by Alan3354(30924)

Question 481071: ax-by = a^2 + b^2
2bx - ay = 2b^2 + 3ab - a^2
Find x and y in terms of a and b??
Click here to see answer by robertb(4012)

Question 481056: Hi could you please solve- 16+ 12x- x^3 when x=3

Click here to see answer by nerdybill(6948)

Question 480937: Translate to an algebraic expression. Use x & y for any variables.
Three less than a product of two numbers.
The translation is?
Click here to see answer by richard1234(5390)

Question 481080: 5x+2y=-13
7x-3y=17
Click here to see answer by mananth(12269)

Question 481079: 0.3x-0.2y=4
0.5x+0.3y=1
Click here to see answer by mananth(12269)

Question 481135: 1) Find the value of (x+y)^2 if x^2 - y^2 = -12 and y-x = 2
2) Given that (x+y)^2 = 289 and x^2 + y^2 =157 , determine the value of (x-y)^2
Click here to see answer by mananth(12269)

Question 481292: Solve this problem in your notebook using all four steps A board 60 in. long is cut into two parts so that the longer piece is 5 times the shorter What are the lengths of the two pieces of board

the shorter piece is_________in
the longer piece is___________in
Click here to see answer by jorel1380(2518)

Question 481307: Given that a(x)=x^2-5 and b(x)=6x=1, evaluate
(b o a)(x)
_____________
Here is what I have tried:
b(x^2-5(x))
6x+1(x^3-5x)
x^3-x+1
Click here to see answer by Alan3354(30924)

Question 481311: Suppos you have 500 grams of a radioactive element whose half-life is 72 years.
Find the function for the quantity, Q, left in t years.
Click here to see answer by ankor@dixie-net.com(15622)

Question 481620: Solve for x:
2^2x - 3 * 2^x - 40 = 0
Click here to see answer by Gogonati(809)

Question 481837: Three-times the sum of a twice a number and four
Click here to see answer by ewatrrr(10682)

Question 482070: PROBLEM...find the 2-digit number whose tens digit is 3 less than the units digit. The original number is 6 more than 4 times the sum of the digits.....
I HAVE SEVERAL PROBLEMS SIMILAR TO THIS ONE AND I AM WONDERING IF THERE IS A STANDARD FORMULA THAT APPLIES TO THIS TYPE OF QUESTION. THANKS!
Click here to see answer by richard1234(5390)

Question 482426: Hi, thanks so so much for helping me out!!! I am working on substitution and am really confused! here is my problem
-5x+3y=12
x+2y=8
I Tried:
-5x+3y=12
x+2y=8
(-5)+2y=8
+5 +5 But then I was told I need 2 answers and I don't know how
2y= 13 to find the second answer!
13/2
y =6.5

Click here to see answer by rfer(12644)

Question 482460: 5a-10b=20
10a+5b=15
Click here to see answer by mananth(12269)

Question 482444: y=x+-2
y=-3x+14
Click here to see answer by mananth(12269)

Question 482484: Assume f(x) = x2 + 2. Find the functional value requested.
f(-8)
Click here to see answer by richard1234(5390)

Question 482706: 15x^2-6x-10=0-6
What is the value of the discriminant?
Which statement is true
The equation has one real solution.
The equation has two imaginary solutions.
The equation has two real sokutions.
Click here to see answer by Alan3354(30924)

Question 482653: rationalize the denominator
sqrt(u)-sqrt(v)/sqrt(u)+sqrt(v)
Click here to see answer by ankor@dixie-net.com(15622)

Question 482778: What are the steps to solving this equation for y?
2y+xy=6
Click here to see answer by solver91311(16868)

Question 482814: How do you do functions?

Click here to see answer by richard1234(5390)

Question 482931: 3/5(x+2)=12
Click here to see answer by jorel1380(2518)

Question 483052: the sum of 18 and a number.
Click here to see answer by jim_thompson5910(28476)

Question 483054: p=s+t+u for u
Click here to see answer by jim_thompson5910(28476)

Question 483084: They ask me to solve this
(5n^3 - 4n) - (n+3^4 - 5 n^3), I don't understand what they want. When I ask online I get this answer
10n^3-5n-81
Click here to see answer by MathLover1(6611)

Question 483167: Please help me solve this word problem: A car is traveling at a speed of 55 miles per hour. You want to write an algebraic expression to show how far the car will travel in a certain number of hours. What will be your constant? What will be your variable?
Click here to see answer by Alan3354(30924)

Question 483181: how do you do properties of real numbers
Click here to see answer by Alan3354(30924)

Question 483228: The length of a side of an equilateral triangle is the same as the length of a rectangle and the width of the rectangle is 2 inches less than its length. If the perimeter of the triangle is 4 inches less than the perimeter of the rectangle what are the dimensions of the rectangle. Please help what are the steps needed
Click here to see answer by gabriel24(6)

Question 483382: I need help solving this literal equation for x. I need to show all work. I would appreciate it if you can help me. d^2 - 4 (x+2) = d(x-2)
Click here to see answer by stanbon(57203)

Question 483487: To play footbag, you kick a small bean bag to keep it in the air. The expression 3m, where m is the number of minutes played, can be used to find the calories burned by a 100 pound person playing footbag. Find the calories burned by a 100 pound person playing footbag for 45 minutes.
Click here to see answer by stanbon(57203)

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