Answer:
87777777777777777777777777
Step-by-step explanation:
Let s be the speed of the person's kayak in still water.
Given, speed of current = 2 mph
Upstream distance = 9 miles
Speed of the person upstream = s-2
Time traveled upstream = 9/s-2
Downstream distance = 13 miles
Speed of the person downstream = s+2
Time traveled downstream = 13/s+2
Given,
9/s-2 = 13/s+2
Cross-multiplying,
9*(s+2) = 13*(s-2)
9s + 18 = 13s - 26
Grouping like terms together,
13s-9s = 26+18
4s = 44
s = 11 mph
Speed of person's kayak in still water = 11 mph
<span>d) y= -50t + 1000
You can re-arrange as
The amount of water left in the pool Y = 1000 gal at the beginning minus 50 gal x number of minutes passed. 1000 - 50t (or -50t+1000)
</span>
Answer:
Step-by-step explanation:
We are going to do a replacement of x for a second equation
So instead
in the place of x we are putting 12-y from the first equation, so
To leave the brackets we need to do multiplication
Which is
How to determine x? From the first equation:
If the x +y = 12 then the x = 12-y so x = 12-7 = 5
We should write solution as a pair:
