### Algebra: Equation

Introduction to Algebraic Equation

Watch the movie, X finds out his value, and answer the following questions.

Given the following:
2x + 4 + x = 8 + 2(3 + x) -3
1. Is this an expression or an equation? Why?
2. What is the variable?
3. Why is an equation like a see-saw?
4. Simplify 2x + 4 + x Answer: ___________________
5. Simplify 8 + 2(3 + x) -3 Answer: ___________________
6. Solve the above for x Answer: x = ________________

1. 1) It is an equation because there is two sides and an equal sign
2) +4, 8 and -3
3) If the see saw is balanced, it is an equation
4) 3x + 4
5) 14+2x
6) x = 7

2. brilliant observation

3. 1. It is an equation because it shows what the left side equals to on the right side.
2. 2x, x, (3+x)
3. It is like a see-saw because when the amount of both sides are the same, it is balanced. When the amount of one side is larger, the see-saw tilts to that side.
4. 3x+4
5. 14+2x
6. 7

4. 1)It is an equation as those shown on the left side are equivalent to that of those on the right side.

2)2x,x,(3+x)

3)It is like a see-saw as it should be equalized and balanced on both sides.

4)(3x+4)

5)(14+2x)

6) x = 7

5. 1. It is an equation as it has an equal sign between two sides
2. 2x, x, and (3+x)
3. An equation shows two things that are equivalent to each other, and, a see-saw can also shows that two things are equal and balanced.
4. 3x + 4
5. 14 + 2x
6. x = 7

6. 1. It is an equation because there is an equal sign dividing the two sides
2. 2x,x and (3+x)
3. It shows the possibilities that one can be of a bigger or smaller number than the other, and also equal.
4. 3x+4
5. 11+2x
6. 7