Algebraic Expressions and Substitution

Work out the value of the following expressions when a = 3, b = 4 and c = 5.
a + b   

• 7

• 8

• 9

• 6

Work out the value of the expression when x = 3, y = – 2 and z = – 4.
y + x – z     

• -5

• -3

• 3

• 5

Evaluate 4y  if       y = 3

• 7

• 12

6h + 30; Solve if h = 6

• 36

• 66

• 96

• 60

Evaluate 8a - b if a = 10 and b = 6

• 74

• 38

• 86

• 8106

Evaluate 2a + 4b 
if a = 10     and    b = 6

• 20

• 24

• 44

• 4

6a - 3d
when a = 1, d = 2

• 3

• 12

• 1

• 0

x + 2x

• 2x²

• 3x

• Can't be simplified

-5a - 2(a - 1)

• -7a + 2

• -9a

• -7a - 2

• 12a - 2

7(a + 8) - 5a + 4

• 2a + 60

• -5a + 60

• 2a + 56

• 7a + 4