Mrs. jones got a new freezer. she
plugged it in, and it began to get cold.
the temperature inside the freezer
dropped 12 degrees every hour for
6 hours. what was the change in the
temperature in the freezer over those
6 hours?

The change would be -72°C.

Step-by-step explanation:

Here, the temperature inside the freezer dropped 12 degrees every hour,

I.e. the change in temperature in one hour = -12°C.

Since, this change is constant for 6 hours,

Thus, the total change in temperature for 6 hours

= 6 × change for 1 hour

= 6 × -12

= -72°C

{x = -1/2 ,   y = -1

step-by-step explanation:

solve the following system:

{2 x + y = -2

{10 x - 3 y = -2

in the first equation, look to solve for y:

{2 x + y = -2

{10 x - 3 y = -2

subtract 2 x from both sides:

{y = -2 x - 2

{10 x - 3 y = -2

substitute y = -2 x - 2 into the second equation:

{y = -2 x - 2

{10 x - 3 (-2 x - 2) = -2

10 x - 3 (-2 x - 2) = (6 x + 6) + 10 x = 16 x + 6:

{y = -2 x - 2

{16 x + 6 = -2

in the second equation, look to solve for x:

{y = -2 x - 2

{16 x + 6 = -2

subtract 6 from both sides:

{y = -2 x - 2

{16 x = -8

divide both sides by 16:

{y = -2 x - 2

{x = -1/2

substitute x = -1/2 into the first equation:

{y = -1

{x = -1/2

collect results in alphabetical order:

answer:   {x = -1/2 ,   y = -1

the answer is ! ?