What are the number lines though?
Give more info.
Answer:
x = -1, y =7
Step-by-step explanation:
3x+y =4
2x+y=5
Multiply the second equation by -1 and add to the first
3x+y =4
-2x-y=-5
-----------------
x = -1
Now find y
3x+y = 4
3(-1) +y = 4
-3+y = 4
Add 3 to each side
-3+3 +y = 4+3
y =7
D. because if you plug the X and Y coordinates into the equation. the equation will always be true
Answer:
ill give you a idea to answer the question
Given:
From 1:00 pm to 3:30 pm the room temperature had dropped from 82F to 72F.
To find:
The average rate of change of temperature in this room over the period.
Solution:
Time between 1:00 pm to 3:30 pm is 2 hr 30 minutes, i.e., 2.5 hours.
So, change in time is 2.5 hours.
Room temperature had dropped from 82F to 72F.
Change in temperature = 72 F - 82 F
= -10 F
We know that, average rate of change of temperature in this room over the period is
Therefore, the average rate of change of temperature in this room over the period is -4. It means the temperature is decreasing 4 F per hour.