Solve the Equation: Finding the Missing Number in 9 + (?) = -1

9+(?)=−1 9+(?)=-1 -2-2-2-1-1-1000111222333444555666777888999-3-3-3

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Complete the missing part
00:04 The number is oriented and positive
00:07 The positive direction on the axis is to the right, so we'll take 9 to the right
00:27 This is the desired number, let's find it on the axis
00:31 Let's find its distance from the point (9)
00:36 The direction of movement is to the left (negative)
00:55 And this is the solution to the question

Step-by-step written solution

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1

Understand the problem

9+(?)=−1 9+(?)=-1 -2-2-2-1-1-1000111222333444555666777888999-3-3-3

2

Step-by-step solution

To know how much we need to add to the number 9 to get minus 1, we will count the number of steps between the numbers.

Also, we will pay attention to which direction we moved, if we moved right then the number is positive, if we moved left the number will be negative.

We will locate the number 9, and move left until we reach minus 1, where each step represents one whole number, as follows:

-2-2-2-1-1-1000111222333444555666777888999-3-3-3

We discover that the number of steps is 10, and since we moved left, the number will be minus 10

3

Final Answer

−10 -10

Practice Quiz

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a is negative number.

b is negative number.

What is the sum of a+b?

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