Question

Vicky records the low temperature for three consecutive days. Between the first and second days the temperature increased 6 degrees. Between the second and third days the temperature decreased 3 degrees. On the third day the low temperature was –6º. What was the low temperature on the first day?

Answer 1

Answer:

The first day temperature was -9°

Step-by-step explanation:

Vicky records the low temperature for three consecutive days.

We don't know the temperature on the first day.

Let assume "x" be the temperature on the first day.

Second the temperature increase by 6 degrees.

Second day = x + 6 degrees

The third day the temperature decreased by 3 degrees

Third day = x + 6 - 3 degrees

The third day temperature was given as -6°.

Therefore, x + 6 - 3 = -6

Now we have to solve for x.

Simplifying the like terms on the right hand side, we  get

x + 3 = -6

Subtracting 3 on both sides, we get

x + 3 - 3 = -6 -3

x = -9°

We took "x" as the first day temperature.

Therefore, the first day temperature was -9°

Answer 2

-9º 

You can figure this out by doing every thing backwards:
 –6º plus 3 degrees the minus 6 degrees