7th Math Unit 2

Evaluate

100

24 - a; when a = -8

32

200

a - b; when a = -8 and b = 12

-20

300

4b + 6; when b = 12

54

400

a/2; when a = -8

-4

500

ab; when a = -8 and b = 12

-96

Algebraic Expressions

100

sixteen less than a number

x - 16

200

five times a number

5x

300

4 less than three times a number

3x - 4

400

sixteen less than twice a number

2x - 16

500

five times a number is three less than the number

5x = x - 3

Solve

100

11 + b = 33

b = 22

200

60 = 12m - 12

m = 6

300

18 = 4a - (-2)

a = 4

400

3b + 30 + 2b = -45

b = -15

500

n + (-10) = 50

n = 60