Question

Use substitution to find the value of the expression.

1) 4x - 4, when x = 5
2) 7 + m -2, when m = 5
3) 5+5h + 3, when h = 2
4) 3n-6, when n = 4

Answer 1

1. 12

2. 10

3. 18

4. 6

Explanation:

In Mathematics, substitution is a method used for solving algebraic equation by inputing the values of a given variable.

1) 4x - 4, when x = 5

4(4) - 4 =

16 - 4 = 12

2) 7 + m -2, when m = 5

7 + 5 - 2 =

12 - 2 = 10

3) 5+5h + 3, when h = 2

5 + 5(2) + 3 =

5 + 10 + 3 = 18

4) 3n - 6, when n = 4

3(4) - 6 =

12 - 6 = 6