SOLUTION: How to represent -2+(-7) on a number line

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Question 1206309: How to represent -2+(-7) on a number line
Found 2 solutions by Solver92311, math_tutor2020:
Answer by Solver92311(821) (Show Source):
You can put this solution on YOUR website!

Start at 0.

Go left two units. That puts you at -2

Go left seven more units. That puts you at -9

John

My calculator said it, I believe it, that settles it

From
I > Ø

Answer by math_tutor2020(3817) (Show Source):
You can put this solution on YOUR website!

Some students may prefer horizontal number lines.
Other students may prefer vertical number lines.

If you like the 1st option, then start at -2.
Then move 7 units left to arrive at -9

If you prefer a vertical number line, then start at -2 and move down 7 units to arrive at -9.

Here are some real world applications of how to interpret -2 + (-7) = -9
You are 2 meters under the ocean's surface. Going down another 7 meters will produce a final depth of 9 meters below the surface.
Your car is parked on the basement 2 level (B2) of a parking garage. Your friend parked his car 7 floors beneath yours, so his car is on level B9.
The temperature is -2 degrees C. After the temperature lowers by 7 degrees, it is now -9 degrees C.
You are 2 dollars in debt. This is represented by -2. Borrowing 7 more dollars brings the total debt to $9