Homework Help: 8th Grade Math (Algebra1)

Posted by Nicole C. on Tuesday, February 3, 2009 at 9:21pm.

I actually have a few different problems that are giving me trouble.
The first:
We have to use the motion problem formula: d=rt and make a table containing the elements:
rate: * time: = distance
------------------------------
label #1
label #2

The Directions for this problem's section:
Make a table, and use systems of equations to solve these word problems.

Problem:

Flying with the wind, a plane travels 1200 nautical miles in 4 hours. Flying against the wind, it travels 500 nautical miles in 2 hours. What is the speed of the plane in still air and the speed of the wind?

***I have figured out that on the table label #1 will be "With the wind" and label #2 will be "Against the wind"***

Thank you so much for any help that I can get!!!

8th Grade Math (Algebra1) - Baby Phat, Tuesday, February 3, 2009 at 9:34pm
Sorry but we never learned that kind of math I wished I could help you I read all the instructions I know math, but not that kind. I'm sorry.
8th Grade Math (Algebra1) - Nicole C., Tuesday, February 3, 2009 at 9:36pm
its alright, I don't get much myself...even after going through this about 4 months ago. thank you for trying!
8th Grade Math (Algebra1) - Nicole C., Tuesday, February 3, 2009 at 9:40pm
Another problem that I have that includes the same directions are:

A plane leaves Lignoier Airport and travels west at 230 mph. A second plane leaves 3 hours later and travels east at 215 mph. How long has each plane flown when the two planes are 1135 miles apart?
8th Grade Math (Algebra1) -Please Help ME!!- - Nicole C., Tuesday, February 3, 2009 at 9:57pm
Please Help me!!!! This is due tomorrow (our teacher gives us one night to do it) and I'm confused and I don't know what to do about it!
8th Grade Math (Algebra1) - Reiny, Tuesday, February 3, 2009 at 10:39pm
Nicole, re your first question

In your chart, in the row "with the wind"
fill in D as 1200, R as x+y, and T as 4

in the row "against the wind", fill in
D = 500, R = x-y, and T = 2

from first row: 1200 = 4(x+y)
4x + 4y = 1200
x + y = 300 (#1)

from second row: 500 = 2(x-y)
2x - 2y = 500
x - y = 250 (#2)

add #1 and#2 ----> 2x = 550
x = 275

sub into #1 275 + y = 300
y = 25
Lignoeir question - Reiny, Tuesday, February 3, 2009 at 10:47pm
"A plane leaves Lignoier Airport and travels west at 230 mph. A second plane leaves 3 hours later and travels east at 215 mph. How long has each plane flown when the two planes are 1135 miles apart?
"

form two rows in your chart:
first: going west
second: going east

Going West: T = t hours, R = 230 km/h, D = 230t km
Goint East: T = t-3 hours, R = 215 km/h, D = 215(t-3)

When is total D = 1135 ?
230t + 215(t-3) = 1135
.
.
t = 4

first one flew 4 hours, the second flew 1 hour.
8th Grade Math (Algebra1) - Alice, Friday, February 6, 2009 at 3:00am
What is domain?
8th Grade Math (Algebra1) - kellie, Wednesday, February 18, 2009 at 6:19pm
y=x+2
8th Grade Math (Algebra1) - hottie, Wednesday, February 18, 2009 at 6:26pm
what is x-2=12?
- 8th Grade Math (Algebra1) - hottie, Wednesday, February 18, 2009 at 6:27pm
  can someone help
8th Grade Math (Algebra1) - Jamiee, Wednesday, February 18, 2009 at 6:34pm
x=14
8th Grade Math (Algebra1) - maria, Thursday, February 19, 2009 at 7:02pm
6-3=
5xO=
(2x)-1
simpllify thesepositive exponents
8th Grade Math (Algebra1) - tj 45, Thursday, February 19, 2009 at 9:14pm
sorry i wish i could help ,but i am kind of confused about this kind of algebra

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