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

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Algebra: Expressions involving variables, substitution

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Question 24193: -3(b-8)-5=9(b+2)
Expand Brackets:
-3b + 24 - 5 = 9b + 18
-12b + 19 = 18
-12b = -1
b = 1/12
Click here to see answer by atif.muhammad(135)

Question 24206: 2m=2-9n
21n=4-6m
solve for m and n.
Click here to see answer by chripchrip(6)

Question 24228: 5x + 9 = x - 23
Click here to see answer by Alwayscheerful(414)

Question 24262: what is 3-(2c+2)=2(c+2)+3c ?
and you also have to do the three steps
1. do the work
2.check the answer
3.answer
Click here to see answer by lolaball(3)

Question 24211: Can you please explain to me how to solve this problem x+y=4 and -3x+12 using substitution?
Click here to see answer by elima(1433)

Question 24253: How do I graph y-x=-5 ? could you show me step by step please . THANKS !!

Click here to see answer by elima(1433)

Question 24296: Solve each system using substitution. Check your solution.
y=4x-8
y=2x+10
Click here to see answer by elima(1433)

Question 24345: The statement above the section of problems is this:
"Solve each equation for the indicated variable."
The problem is this:
T + M = R, for T
I don't understand how to do this problem. Can you explain it to me? Thank You!
Click here to see answer by askmemath(368)

Question 24337: Multiply Choice:: Solve 4x - 3(x + 2) = 5(4 - x)
(A) -4 1/3
(B) 4 1/3
(C) 3/13
(D) -3/13
(E) no solution
I tried to solve this but my answer didn't match one of the answers above.

Click here to see answer by yhtong(11)

Question 21613: Let # (a,b,c) = a(b + c). What is the value of the expression #(#(0,2,3), #(5,4,7), #(3,4,2))?
Click here to see answer by venugopalramana(3286)

Question 24412: D=F-(M+N) FIND F?
V=Vo-32t Find for t?
R=h(p+3q) Find for q?
Im stuck with these three. Can you help?
Click here to see answer by wuwei96815(245)

Question 24455: If x^2+2x=3, then x could equal?
Click here to see answer by AnlytcPhil(958)

Question 24478: I have a story problem that is giving me a problem could somebody please help?
Mr.Adams buys a bag of apples and a bag of pears for a total of 14$. There are eight pounds of fruit in all. The apples cost $1.50 per pound, and the pears cost $2.30 perpound. HOw many pounds of pears did he buy?
Click here to see answer by Paul(988)

Question 24610: sixteen more than the square of a number is 8 times the number. find the number.
Click here to see answer by Paul(988)

Question 24644: solve for t:
c= -2t+4 / t
Click here to see answer by stanbon(26259)

Question 24761: 2zx^2y=18
x=1
y=z
Click here to see answer by rapaljer(3620)

Question 24661: I was ask to use distributive property to write the expression without parentheses and then simplify if necessary. My problem is that I'm not sure if I should simplify it to -24n+ -27 or -51n.
Click here to see answer by elima(1433)

Question 24763: I have worked on this problem and I do not know where I'm going wrong but I know the answer I'm coming up with is incorrect.
Use elimination to solve: x/3+4y=30 and 2x-y=5 I got 22/25 and -2 I just know this is incorrect. PLEASE HELP!!!!
here is another one I can not figure out: Use elimination to solve: 6x-y/4=-9
and 3x+2y= -30
this would be a great help. thank you :)
Click here to see answer by daleswift(2)

Question 24858: Substitutions.
Please help me find 3x-y+4
2x-3y+-9
I keep getting a repeating decimal as the answer. Thank you.
Click here to see answer by rapaljer(3620)

Question 24829: 3x.(2+-19)7(8.4)=
Click here to see answer by Alwayscheerful(414)

Question 24878: Please help me solve this problem:
What is 5 times the sum of 2 consecutive even integers is at most 16
Click here to see answer by myespinosa(1)

Question 24924: WRITE IN EXPRESSION FOR THE # OF BORDER TILES NEEDED FOR A POOL THAT IS L FEET LONG AND W FEET WIDE? DO YOU KNOW THE ANSWER IF SO CAN YOU GIVE ME THE ANSWER AND AN EXPLANATION ON HOW YOU WORKED OUT THE EQUATION? THANK YOU NEED TO HELP THE KID WITH HOMEWORK.....
Click here to see answer by stanbon(26259)

Question 24926: 2x+y=8
3x-2y=5
Click here to see answer by smartypants(7)

Question 24925: 2x+y=8
3x-2y=5
Click here to see answer by pwac(251)

Question 24945: At a proffessional basketball game,the turstile count showed that 17,406 people paid admission. The total cash received for tickets was $133,372. Without actually counting the ticket stubs,find out how many paid for reserved seats ($10.00 each)and how many paid in general admission($6.00)
Click here to see answer by Paul(988)

Question 25161: 9(2x+8)=20-(x+5)
Click here to see answer by rapaljer(3620)

Question 25250: A sporting goods store sells right-handed baseball gloves. In one month, 12 gloves were solf for a total of $561. Right-handed gloves cost $45 and left-handed gloves cost $52. How many of each were sold?
Click here to see answer by Paul(988)

Question 25254: You are buying meat for a cookout. You need to buy 8 packages of meat. A package of hotdogs costs 1.89 and a package of hamburgers costs 5.19. You spend a total of 31.62. How many packages of each kind of meat did you buy?
Click here to see answer by Paul(988)

Question 25229: solve each system by substitution indicate solution as an ordered pair
y=2x
x+y=12
Click here to see answer by elima(1433)

Question 25333: PLEASE HELP ME SOLVE 2/9s=-6 the fraction is 2 over 9
Click here to see answer by Alwayscheerful(414)

Question 25366: I just have 2 problems I don't remember how to do but I don't know what topic to find them under.
1) 2/x +3/4 Combine and simplify.
2) x/4=3/7 Solve for the exact value of x.
Click here to see answer by longjonsilver(2297)

Question 25256: Zach invests $4000, part of it at 10% annual interest and the rest at 12% annual interest. If he earned $460 in interest at the end of one year, how much did he invest at each rate?
Click here to see answer by elima(1433)

Question 25299: I'm sorry if this is the wrong topic. I'm not sure what this is listed as. The directions say to "find the missing term" one of the problems is _?_ + 12 I know how they got the first and last numbers, I just don't know what to do to find the middle term. The book says that the answer is 22x. Can you tell me how they got that? Thanks.
Click here to see answer by askmemath(368)

Question 25307: Let a # b be defined as 3a-b. What is the value of 5 # (-2)
Click here to see answer by askmemath(368)

Question 25464: 2x-3y=12
x=4+2y
Click here to see answer by elima(1433)

Question 25555: solve using system of elimination.
4x-3y=11
3x-5y+-11
wut r the steps to solve this equation
Click here to see answer by bacos(9)

Question 25596: Solve for x:
x = (x - y) * z
Click here to see answer by stanbon(26259)

Question 25531: solving systems by elimination method addition and subtraction x + y = 18 x + 2y = 25
Click here to see answer by elima(1433)

Question 25724: We are working with substitution and elimination right now on story problems to solve systems of linear equations. I am not sure how you use ratios in equations like that. This is the problem:
Kay spends 250 min/wk exercising. Her ratio of time spent on aerobics to time spent on weight training is 3 to 2. How many minutes per week does she spend on aerobics? How many minutes per week does she spend on weight training?
I'm sorry if this is already posted somewhere. I'm just not sure how to work the ratios into the equation. Thank you!!
Click here to see answer by stanbon(26259)

Question 26080: 5 divided by the square root of 3
Click here to see answer by stanbon(26259)

Question 26162: Here's another question:
Simplify: Heres the question...2(x+5y)+ (-3)(7x-y)=

Heres what i got- 2(x+5y)+ (-3)(7x-y)=
(2x+10y) + (-3)(7x-1y)
12xy + (-3)(6xy)
18xy+ -3

*Thats the answer i got but its not the correct one. It should be -19x+13y. But i didn't get that. So i would appriciate if you could help me get the right answer...please brake it down so i understand it! Thanks alot!!!

Click here to see answer by stanbon(26259)

Question 26207: The perimeter of a triangle is 26 centimeters. Side A of the triangle is 3 centimeters longer than side B. Side C is 1 centimeter shorter than twice side B. Find the length of each side please.
I've tried and tried this problem over and over again. If you could just break it down into steps for me that'd be awsome! Thanks a lot! :-D
Click here to see answer by Paul(988)

Question 26215: I've tried... believe me I have! ahhhhh! It seems so simple to most people, but this just wont go through my head! H-E-L-P please!
Side A of a triangle is tice side B. Side C is 2 meters shorter than side A. The perimeter is 98 meters. Help me find the length of each side please?
:-D thanks times a bajillion!
Click here to see answer by queenofit(120)

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