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

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

Question 35530: i need help with
7(-3)(-4)
Click here to see answer by Prithwis(166)

Question 34952: can you help me solve this problem?
rh^2-ph+q=0 solve for h
this is what i have so far
rh^2-ph=-q
h(hr-p)=-q
?
Click here to see answer by stanbon(57282)

Question 35932: Im not sure what they want me to do.
Find g(9) given that g(x) = 2x + 3
Click here to see answer by rapaljer(4667)

Question 36157: help me solve this equation -4+(-8)
Click here to see answer by zack11690(1)

Question 36161: help me solve this equation 3+4-20/5*2
Click here to see answer by checkley71(8403)

Question 36163: help me solve this problem 3+4-20/5*2
Click here to see answer by rapaljer(4667)

Question 36201: I need help solving these problems with complex numbers
write the sum as a complex number in standard form
(-5+5i)+(-2-3i)
and
(-3+5i)(-4+3i)
Click here to see answer by Prithwis(166)

Question 36286: solve
4a-5b-c=-26
5a+b+2c=-5
2a+4b+c=6
show work
Click here to see answer by vidhyak(94)

Question 36295: how would I solve this problem to simplify for like terms?
3(4x+6)+7x
Click here to see answer by checkley71(8403)

Question 36284: add and simplify:
y over y^2-49 + 7 over y^2+8y + 7
show work
Click here to see answer by rapaljer(4667)

Question 36528: Please help me!!!! I need to solve this for H:
2A-ha=hb
A)h=a-b/2A
B)h=2A/a-b
C)h=a+b/2A
D)h=2A/a+b
Please show me step by step how to figure this out...thanks
Click here to see answer by vidhyak(94)

Question 36529: Please show me how to figure this out...
I need to find the x-value of
x-2y=-6
y=3x-2
A)x=1
B)x=2
C)x=4
D)x=4/5
thanks!

Click here to see answer by vidhyak(94)

Question 36594: simplify the following
uw^2/u^4w^3
Click here to see answer by checkley71(8403)

Question 36932: a^2+b^2=52 and a^2-b^2= 20 Solve for b
Click here to see answer by venugopalramana(3286)

Question 36995: x=y-4
2x+8=2y
solve using elimination, substitution or graphing
could this be no solutions?
Click here to see answer by checkley71(8403)

Question 37049: Could you please help me with this equation?
x+2y=5
3x-15+-6y
It has to be solved using elimination or substitution.
I need serious help!!!!
Click here to see answer by stanbon(57282)

Question 37047: Could you please help me? I have been haveing serious problems with this equation.
y=4x+1
y=4x-3
It has to be solved useing elimination, or substitution. And i have tryed both. Could you please help?
Click here to see answer by checkley71(8403)

Question 37239: Solve each of the following systems by substitution.
5x – 2y = -5
Y – 5x = 3

Click here to see answer by checkley71(8403)

Question 37349: Please help..how do i work this problem. I have to factor the numerator and denominator as completely as possible, then divide out all the like factors (one for one) in numerator and denominator.

25x —————-———— 10x + 15 Please show me the details of getting the answer so i may understand how it is done. Thank you, Sean

Click here to see answer by AnlytcPhil(1276)

Question 37387: If 3x+y=6, then what is y?
Please show us how you are doing this so we can figure it out.
Thank you
Click here to see answer by fractalier(2101)

Question 37390: 3a+6b=-15
a=-2b-5
Use the substitution method to solve the system. If its dependant or inconsistant, so indicate.
Click here to see answer by fractalier(2101)

Question 37395: r+3s=9
3r+2s=13
Use substitution method to solve system.
If its dependant or inconsistant, so indicate
Click here to see answer by fractalier(2101)

Question 37398: 2a=3b-13
b=2a+7
Use substitution method to solve system .
If system is dependant or inconsistant so indicate.
Click here to see answer by fractalier(2101)

Question 37405: x-2y=2
2x+3y=11
use substitution method to solve system
if dependant or inconsistant please indicate
Click here to see answer by fractalier(2101)

Question 37407: 5u+3v=5
4u-v=4
use substitution method to solve system
if dependent or inconsistent, so indicate
Click here to see answer by checkley71(8403)

Question 37403: x-2y=2
2x+3y=11
use substitution method to solve system
if dependant or inconsistant so indicate
Click here to see answer by checkley71(8403)

Question 37412: a=b+3(4-c) if b equals 5 and c equals 2, what is the value of a? please show me the work so i can understand how to do it myself
Click here to see answer by checkley71(8403)

Question 37411: a=b+3(4-c) if b equals 5 and c equals 2, what is the value of a?
Click here to see answer by fractalier(2101)

Question 37245: Solve each of the following systems by substitution.
4x – 12y = 5
-x + 3y = -1
Click here to see answer by fractalier(2101)

Question 37396: Is there a formula that could be used to explain how you add consecutive numbers to make multiples of 100.eg.18+19=19=20=21=22=100 38+39+40+41+42=200 that would be suitable for a twelve year old to be able to solve such problems?
Click here to see answer by checkley71(8403)

Question 37342: Lisa Chen invested $24,000, part of it at 8% and the rest at 7.2%. How much did she invest at each rate if her income from the 8% investment is 2/3 that of the 7% investment?
This is a multiple choice question so by inserting different answers I was able to figure out that the answers are $15,000 at 7.2% and $9,000 at 8%. I still don't know how to do the problem though. Please help me with this one. Thanks!!
Click here to see answer by checkley71(8403)

Question 37309: help me with the substitution method word problems.
----------------------------------------------------
Mrs. brighton invested $30,000 and received $2300.00 in interest. If she invested part of the money at 10% and the remainder at 5%, then how much did she invest at each rate ?
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tickets for a concert we're sold to adults for $3.00 and to students at $2.00. If the total receipts we're $824.00 and twice as many adult tickets as student tickets we're sold, then how many of each we're sold ?
Click here to see answer by checkley71(8403)

Question 37589: Can someone help me with these questions please?
A principal of $5000 was invested in a savings account for 4 years. If the interest earned for the period was $400, what was the interest rate?
Allen bought 20 stamps at the post office in 37¢ and 20¢ denominations. If the total cost of the stamps was $7.06, how many 37¢ stamps did Allen buy?
The perimeter of a rectangle is to be no greater than 300 in., and the length must be 125 in. Find the maximum width of the rectangle.
One number is 8 less than another. If 5 times the smaller number minus 2 times the larger number is 14, find the two numbers.

Click here to see answer by Nate(3500)

Question 37609: How do I Solve the system by graphing. 4x + 4y = 4
x + y = 1
Click here to see answer by Nate(3500)

Question 37628: Here is a word problem that involves the vertical motion formula of h=-16t^2 + vt +s. The problem is if a person on a creek bed throws a rock straight up at a speed of 64 feet per second. 1) when will the rock reach a maximum height? 2) when will the rock hit the water again?
This is how I have satrted: I used the formula by putting 64 in the v spot and 0 in the s spot because I started at 0. It looks like this
h=-16t^2 + 64t +0. I worked it out and got 2(1+-1) =t so my answer would be
t=0 and t=4 If that is right then would the answer to #1 be half of that which is 2 seconds and the answer to #2 would be 4 seconds when it hits the water again. Am I on the right path or am I totally off?
Click here to see answer by Earlsdon(6287)

Question 37703: x+y=38
x=2y-25
must solve using substitution
Click here to see answer by checkley71(8403)

Question 37702: Must solve using substitution
2x+y=4
y=4x+1
Click here to see answer by checkley71(8403)

Question 37701: must solve using substitution
-2x+y=6
y=3x+9
Click here to see answer by piglet162431(90)

Question 37002: x+2y=5
3x-15= -6y
I'm trying to solve this by elmination or substitution method, or is it no solution?
I've tried:
6y+3x=-15
2y+x=5
3(2y+x)=5
6y+3x=-15
6y+3x=15
0=15
but my y and x expressions will cancel out and i'm left with no solution
Click here to see answer by ilana(307)

Question 37999: Phil & phyllis are siblings. phyllis has twice as many brothers as she has sisters. phil has the same number of brothers as sisters. how many girls and how many boys?
Click here to see answer by fractalier(2101)

Question 36628: Can someone help me solve this for X:
4x/x-4 +1 = 3x/x-4
A)x= 2
B)x= -2
C)x= -1/2
D)x= 1/2
Please show me your work so that I can learn how to do this.
Click here to see answer by stanbon(57282)

Question 37992: sove:
x-y=0
y=x to the power of 2
Click here to see answer by fractalier(2101)

Question 37988: Find the slope of the line passing through the points (1,1) and (3,3).
Click here to see answer by checkley71(8403)

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