R=rate of boat in still water
c=rate of current
d=rt
since you're given that the time it takes to travel the same distance downstream and upstream, your equation will be d_1=d_2, or rt=rt
the rate upstream is r-c and the rate downstream is r+c (because the boat's and river's rates add up)
since you know t_1 and t_1 are 5 and 3, you can now set up 2 equations
<u>5*(r-c)=45</u> because (time upstream)*(rate upstream)=distance=45 miles
r-c=45/5=9
<u>3*(r+c)=45</u>
r+c=45/3=15
r-c=9 and r+c=15, so r=12 mi/h and c=3 mi/h
If you have any questions please ask
Answer:
x = 1
Step-by-step explanation:
3 (x + 1) = -2 (x - 1) + 6
Expand the brackets on both sides.
3x + 3 = -2x + 2 + 6
3x + 3 = -2x + 8
Solve for x.
3x + 2x = 8 - 3
5x = 5
x = 1
Hope this helped!
Answer:
-6y
Step-by-step explanation:
3y-3y=0
-4x-2x=-6x
