Do Now:
Solve the system by elimination:
6x - 3y = 27
2x - 3y = 11
6.4
Solving Systems by Elimination
Using Multiplication
x - y = -8
7x + 5y = 16
6x + y = -39
3x + 2y = -15
{
2x - 3y = 0
3x - 2y = 5
A personal aircraft traveling with the wind flies 520 miles in
4 hours.
On the return trip, the airplane takes 5 hours to travel the
same distance.
Find the speed of the airplane if the air is still.
rate
with the
wind
against
the wind
time
distance
r t = d
A fishing boat travels 10 miles downstream in 30 minutes.
The return trip takes the boat 40 minutes.
Find the rate in miles per hour of the boat in still water.