Grade 7 - Mathematics 2.1 Value of an Expression - I

Example: Find the value of expression 7x+9, when x=2.

Solution: Substitute the value x=2 in the given equation:
7x+9 = 7*(2) + 9 =14 + 9 = 23.
Therefore the value of the expression when x=2 is 23. Answer: 23

Directions: Solve the following expressions and show your work. Also write at least ten examples of your own.