This graph shows the outside temperature (in degrees Celsius) over the course of 12 hours, starting at midnight (x = 0). Part I:
a) What is the domain

b) What does the domain mean in terms of the problem

Part II:
a) What is the range?

b) What does the range mean in terms of the problem?

Part III:
a) When is the function decreasing?

b) What does this decreasing interval mean in terms of the problem?

Please help!!

Estimate (eye-ballin'): slightly less than (3, 3)

Calculation: (2.6, 3.2)

Step-by-step explanation:

Given:

4x + 3y = 20

y = 2x - 2

Sophia's strat is absolutely correct. She makes two equations into one. This is called "substitution":

- Insert y of 2nd equation as y in 1st equation:

4x + 3(2x - 2) = 20

**Remember to multiply the entire thing by 3**

4x + 6x - 6 = 20

**Solve for x**

10x - 6 = 20

10x = 26

x = 2.6

Now that we have x, just plug it into any equation (hint 2nd is easier):

y = 2(2.6) - 2

y = 3.2

COORDS: (2.6, 3.2)