Understanding Substitution and Simplification in Algebra

The video tutorial provides practice in substituting positive and negative values for variables in mathematical expressions. It begins with a simple example of evaluating X minus negative Y, where X is -2 and Y is 5, and progresses to more complex expressions involving multiple substitutions and simplifications. The tutorial also demonstrates using a number line to visualize and solve expressions, emphasizing the importance of understanding foundational math skills.

What is the result of substituting X = -2 and Y = 5 into the expression X - (-Y)?

• -3

• -7

• 3

• 7

How can the expression 3 - (-6) + (-H) + (-4) be simplified before substituting H = -7?

• 3 - 6 - H - 4

• 3 + 6 - H - 4

• 3 + 6 + H + 4

• 3 - 6 + H + 4

After simplifying the expression 3 - (-6) + (-H) + (-4), what is the result when H = -7?

• 12

• 7

• 5

• 9

On a number line, what is the result of E - F if E = -2 and F = 4?

• -2

• 6

• 2

• -6

If T = -6 and U = 3, what is the result of T + (-U) using a number line?

• 3

• -3

• -9

• 9