Combining Like Terms and Inverses

Mrs. Lopez introduces the concept of generating equivalent expressions in a Grade 7 math lesson. The lesson covers additive inverses, opposites, and how they sum to zero. It explains how to convert subtraction into addition of opposites and demonstrates combining like terms. The video includes examples and practice problems to reinforce these concepts.

What is the sum of a number and its additive inverse?

• The number itself

• Negative of the number

• 0

• 1

If you have 3 and its opposite, what is their sum?

• 6

• 3

• -3

• 0

What is the opposite of the sum of X and 3?

• -X - 3

• X + 3

• X - 3

• -X + 3

How do you convert subtraction into addition?

• By adding zero

• By adding the opposite

• By subtracting the opposite

• By multiplying by zero

What is the result of combining 3x and -4x?

• 0

• 1x

• -1x

• 7x

What is the sum of 5 and -7?

• -12

• 12

• -2

• 2

If you have 5x and -4x, what is the result when combined?

• 0

• 9x

• 1x

• -1x

What is the result of adding 7 and 9?

• -16

• 16

• -2

• 2

What is the opposite of -9?

• 9

• 0

• -9

• 18

What is the result of combining -6z and 13z?

• -19z

• -7z

• 7z

• 19z