Basic Arithmetic and Algebra Concepts

Mrs. Back introduces evaluating algebraic expressions, demonstrating with examples. She explains substituting values into expressions and solving them, emphasizing the importance of understanding the opposite signs in subtraction. The video includes practice problems and solutions, reinforcing the learning objectives of substituting and evaluating expressions correctly.

What is the first step in evaluating algebraic expressions?

• Substitute the given values

• Multiply the numbers

• Add the numbers

• Divide the numbers

In the expression a - b, if a = -3 and b = 5, what is the result?

• 2

• 8

• -8

• 0

What should you do after substituting the values in an algebraic expression?

• Multiply the numbers

• Solve the expression

• Ignore the expression

• Add the numbers

What is the opposite of -5?

• 5

• 10

• 0

• -5

What is the opposite of -3?

• 3

• -3

• 0

• 6

What is the result of 3 + 5?

• 0

• 3

• 5

• 8

In example two, what are the values of x and y for part A?

• x = -5, y = 8

• x = 5, y = -2

• x = -3, y = 5

• x = 2, y = -7

What is the result of x - y when x = 2 and y = -7?

• 5

• 9

• 0

• -9

What is the opposite of -7?

• 14

• 0

• 7

• -7

What is the result of 2 + 7?

• 9

• 2

• 0

• 7