3(2x-1)=x+2

3(2x-1)=x+2

Toevaluate a variable expression, replace the variable(s) with the given value(s) and use the order of operations to simplify.

Example 1: Evaluate 10y + 3 for y = 6.

10y -f 3 = 10(6) + 3 Replace y with 6 since 6 is the given value.

= 60 + 3 Order of operations says to multiply first.

= 63 Add.

Example 2: Evaluate -6p – 15 for p = -4.

-6p – 15 = -6(-4) – 15 Replace p with -4 since -4 is the given value.

= 24-15 Order of operations says to multiply first.

= 9 Subtract.

Practice on Your Own

Evaluate each expression for the given value of the variable.

1. 7x + 1 for x = 5 2. 8m – 12 for m = 5 3. 2y + 9 for y

= -6

4. 6p – 3 for p = -4

5. 27 – 9x for x = 2

6. 10 + 4q for q = -3

7. -7c + 11 for c = 3

8.1/3t + 5 for t = 9

9. 1/2m – 16 for m = 20

Check

‘Evaluate each expression for the given value of the variable.

10. 2n – 3 for n = 9 11. x + 7 for x = -5 12. 15 – 3h for h = 5

13. 15 – 7m for m = 3 14. -5a – 9 for a = -1 15. 1/2y + (-4) for y = 12