8th Grade Math (Algebra1)
posted by Nicole C. on .
I actually have a few different problems that are giving me trouble.
We have to use the motion problem formula: d=rt and make a table containing the elements:
rate: * time: = distance
The Directions for this problem's section:
Make a table, and use systems of equations to solve these word problems.
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!!!
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.
its alright, I don't get much myself...even after going through this about 4 months ago. thank you for trying!
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?
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!
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
"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.
What is domain?
what is x-2=12?
can someone help
simpllify thesepositive exponents
sorry i wish i could help ,but i am kind of confused about this kind of algebra