-2(y-3)=22
-2y+6=22
-2y=16
y=-8
Answer:
6
Step-by-step explanation:
For this case, the first thing we must do is define variables.
We have then:
x: number of minutes
y: final temperature
We write then the equation that models the problem:

For y = 20 we have:

Clearing x:
Answer:
The temperature of the water will be 20 degree celcius after 150 minutes
Well you gotta find out what x means
Depends on your state. Each state is different. I'll try to post the complete list.
Hope this is what you are looking for!