Algebraic Expressions

Evaluate the expression 3x + 5 when x = 2.

• 7

• 15

• 8

• 11

Answer explanation

Evaluate the expression 3x + 5 when x = 2.

=(3 x 2) + 5

= 6 + 5

• = 11

Simplify the expression 2(3x + 4) - x when x = 1.

• 10

• 7

• 16

• 13

Answer explanation

Simplify the expression 2(3x + 4) - x when x = 1.

= 2 (3(1) + 4) - 1

= 2 (3 + 4) - 1

= 2 (7) - 1

= 14 - 1

= 13

Find the value of 4y - 2y + 7 when y = 3.

• 13

• 5

• 10

• 15

Answer explanation

Find the value of 4y - 2y + 7 when y = 3.

= 4(3) - 2(3) + 7

= 12 - 6 + 7

= 6 + 7

= 13

Evaluate the expression 5(2x - 3) when x = 4.

• 15

• 25

• 10

• 20

Answer explanation

Evaluate the expression 5(2x - 3) when x = 4.

= 5 (2(4) - 3)

= 5 (8 - 3)

= 5 (5)

= 25

If x = 3 and y = 2, simplify the expression 4x + 2y - 3.

• 13

• 10

• 5

• 7

Answer explanation

If x = 3 and y = 2, simplify the expression 4x + 2y - 3.

= 4(3) + 2(2) - 3

= 12 + 4 - 3

= 16 - 3

= 13

Evaluate the expression 6y - 2 when y = 4.

• 18

• 20

• 22

• 24

Answer explanation

Evaluate the expression 6y - 2 when y = 4.

= 6(4) - 2

= 24 - 2

= 22

Randy bought c twenty-cent stamps and 2 forty-cent stamps. How much did he spend altogether?

• $ (20c + 80)

• $100c

12a + 6 - 3a - 3 is the same as _________

• 9a + 3

• 9a - 3

• 9a + 9

• 9a - 9

Answer explanation

12a + 6 - 3a - 3 is the same as _________

= 12a - 3a + 6 - 3

= 9a + 3

Andy is d years old. His father is thrice as old as him. What will his father's age be in 8 years' time?