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 26213: okay... welcome to my nightmear!
The perimeter of a triangle is 33 centimeters. The first side is 5 cetimeters shorter than the second, and the third is twice the first. Find the lengths of the sides...
I have a hard new class that I just entered and I'm not caught up yet. I've gotten as much help as I could, and this problem is the basis of the rest of my homework so if I could get this answer than I could probably figure the rest out. If you could show me the steps of the problem so that I can follow it... I would be eternally greatfull!
thank you :-p
Click here to see answer by longjonsilver(2297)

Question 26214: An ice hockey rink is a rectangle with a perimeter of 174 meters. The length is 9 meters more than twice the width. Find the length and width...
this problem is frustrating...I need it in steps please :-) I could really use some help fellas! :-| eeck
thanks so much!!!
Click here to see answer by queenofit(120)

Question 26211: I thought this problem would keep me up all night! Then I found this tutoring thing and THANK GOD! Because I am super stuck!
*A triangular course for a sailing race is marked off by buoys. The first leg is 250 meters longer than the second, and the third leg is 100 meters shorter than the first. If the length of the course is 2500 meters, find the length of each leg please.*
thankyouthankyouthankyou! this website and you tutors are LIFESAVORS!
:-D
I owe you guys big time!
-Ellyn
Click here to see answer by longjonsilver(2297)

Question 26231: i started an online math class. it has been sometime since i have done this math. it is a word problem.
a bus leaves the station at 1pm. traveling west at an average rate of 44mph. one hour later a second bus leaves the same station, traveling east at a rate of 48mph. at what time will the two buses be 274 miles apart..
i am not sure how to start this equation:44x+1=274, 48y-1=274
Click here to see answer by Paul(988)

Question 26230: I understand how to do substitution. However, I can't seem to figure this one out. My dad and I worked on it for two hours last night. Do you have any hints on this one?
3y + x = -1
and
x = -3y
Click here to see answer by longjonsilver(2297)

Question 26251: The word problem reads: a train leaves town a for town b, traveling at 35 mph. at the same time, a second train leaves town b for town a at 45 mph. if the two towns are 320 miles apart, how long will it take for the two trains to meet.
i did 35x=320:x=9, 45x=320:x=7:: i figured 9 hours was the answer. i am not sure. these word problems are tricky for me.
Click here to see answer by Paul(988)

Question 26248: I almost have this. I just have a problem filling in the formulas from word problems. the word problem reads: Martina leaves home at 9am bicycling at a rate of 24mph. 2 hours later, john leaves driving at the rate of 48 mph. at what time will john catch up with martina. i had 48=24(2x). the equation is true.. i dont if it is right for this problem.
Click here to see answer by Paul(988)

Question 26256: There are 850 douglas fir and ponderosa pine trees in a section of forest bought by sawz logging co. The company paid a average of $300 for each douglas fir and $225 for each ponderosa pine. if the company paid $217500 for the trees, how many of each kind did the company buy. I wasnt sure at all how to get this one started. i am not sure if which number i am trying break down.
300x+225x-850=217,500. that doesnt make logical sense to me. i know it will 300x and 225x. I am not sure where to go from there.
Click here to see answer by Paul(988)

Question 26203: The length of a rectangle is 5 cm more than twice the width. The perimeter is 82 cm. Find the length and width.
Click here to see answer by elima(1433)

Question 26204: The length of a rectangle is 3 timess the width. The perimeter is 120 meters. Find the length and width.
Click here to see answer by elima(1433)

Question 24128: Use the batting average formula, a = h/n. What is the number of hits h for a = 0.245 and n = 25?
Click here to see answer by stanbon(26259)

Question 26299: Determine the standard form of the equatiion of the line that contains (-6,-6) and (-5,-2)
Click here to see answer by stanbon(26259)

Question 26336: simplify please:
can't get this one through my brain,its been bugging me for forever!
thanks!
Click here to see answer by longjonsilver(2297)

Question 26335: simplify : (5a)(5b)(5c)(2d)
is this possible?
thank you :-)
Click here to see answer by longjonsilver(2297)

Question 26334: kay, I need to simplify 3(4n)
I've tried looking up how to do this in my book, emailed my teacher, called my friends. It's just one of those pesky problems that you can't figure out without help. :(
help please?
thanks a ton! :-D
Click here to see answer by longjonsilver(2297)

Question 26333: okay, here's my problem... it just doesn't make sense to me or any of my frends!
simplify : (3p)(4q)(6r)
?????
and ideas?
cause I'm out of them!
gratzias
Click here to see answer by longjonsilver(2297)

Question 26343: x+x=o
Click here to see answer by longjonsilver(2297)

Question 26212: The first side of a triangle is 8 meters longer than twice the second side, The third side is 3 times the second side. The perimeter is 128 meters. I'm supposed to find the lengths of three sides... I've done and redone this problem, it doesn't seem to make sense...
help please O:-)
thank you
-a VERY greatful student in need
Click here to see answer by askmemath(368)

Question 26209: The first side of a triangle is 8 meters longer than twice the second side. The third side is 3 times the second side. The perimeter is 128 meters. Find the lengths of the three sides.
Click here to see answer by uknouluvme89(30)

Question 26369: How Do I solve x=3y-1
x+2y=9
Click here to see answer by mathrebel(25)

Question 26372: How do you solve 6x-y=-4; x+2y=7 using substitution method?
Click here to see answer by stanbon(26259)

Question 26402: 2+2...?
Click here to see answer by ellygirl5969(8)

Question 26406: How do I...Solve the system by addition.
5x-3y=13
4x-3y=11
Thanks you in advance for your help.
Click here to see answer by stanbon(26259)

Question 26429: My problem is
2(x-3)-3(x+5)=3(x-2)-7
I need to solve for x and I can not get the answer. I have gotten so many different answers for x. I get a different answer everytime. How do I do this problem?
Click here to see answer by Earlsdon(4898)

Question 26291: 2r+3s=0 r+5=6s
Click here to see answer by Alwayscheerful(414)

Question 26205: The perimeter of a rectangle is 400 meters. The length is 15 meters less than 4 times the width. Find the length and width.
Click here to see answer by uknouluvme89(30)

Question 26297: Find the genral form of the equation of the line that passes through the points (1, -3) and (5, 2)
Click here to see answer by elima(1433)

Question 26521: I am struggling some with solving equations using substitutions. Here is a one question on my homework assignment.
y= 3x - 10
y= 2x -15
My answer was --> y= 5x^2 - 25
Amy I even close, I really dont understand substitutions. My parents are working on getting me a tutor.
Click here to see answer by Paul(988)

Question 26158: This is my first year in Algebra, and i find it kind of confusing and complicated...I have a question on this problem. "Thanks for your help."
Simplify.
-m + 2/3m - 1/2n + 5/2 n= I Don't Understand how you would
get the answer to this problem.

Click here to see answer by stanbon(26259)

Question 26585: 5-8+x=-12
3.6+x=-7.3
Click here to see answer by Alwayscheerful(414)

Question 26647: 48% of X = 60

Click here to see answer by longjonsilver(2297)

Question 26509: simplify the expression
(35-10q)(-2/5)
Click here to see answer by longjonsilver(2297)

Question 26572: Solve the system by addition or substitution.
3x + 6y = 0
x = 2/3
Thank you so much.
Click here to see answer by elima(1433)

Question 26778: 3x+5y=2
x+4y=-4

Click here to see answer by dannii11691(1)

Question 26746: What is the solution and graphing points of the equation:
6x+5y=-7
y=-x-2
Click here to see answer by elima(1433)

Question 26878: I don't understand how to come up with the answer to this equation:
. The answer is -20/15=-4/3. Can you explain this to me.
Thanks
Click here to see answer by bmauger(101)

Question 26883: HELP!!!! Translate to a system of equations and solve:
The difference between two numbers is 16. Three times the larger number is seven times the smaller. What are the numbers?
What we've tried: a-b=16 3a=7b That's about all I've done...I'm so confused I don't know where to begin.
Thanks!
Click here to see answer by bmauger(101)

Question 26880: how do you write the following using symbols?
x multiplied by 9
12 divided by n
11 increased by z
y decreased by 5

Click here to see answer by vincygrrl22(7)

Question 26888: The sum of two numbers is 15 less than twice the first number. Their difference is 5 less than twice the second number. Solve and explain
Thank you
Click here to see answer by Paul(988)

Question 26894: what is 3/4y>1 4/5 i have tried to subtract 3/4 from 1 4/5
Click here to see answer by bmauger(101)

Question 26962: how do u solve this by using substitution
x+2y=6
x-3y=-4
Click here to see answer by elima(1433)

Question 26978: x = 74 - y
x = y + 16
I am totally confused on this one I have 74 - y = y + 16 and can not go any futher
Click here to see answer by longjonsilver(2297)

Question 27038:
Please help me solve this equation
16 = P4 ( to the 4th power)
Click here to see answer by longjonsilver(2297)

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