Plug In Number Substitution

If a = 4 and b = 6, what is the value of 3a + 5b?

• 40
• 42
• 44
• 46

If x = 5, find the value of 7x-1.

• 34
• 36
• 35
• 37

If y = 4, find the value of 3y+5.

• 27
• 12
• 17
• 18

If y = 7, find the value of 2(y+4).

• 11
• 22
• 20
• 12

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

• 7
• 8
• 9
• 6

3x + 7y

What are the numbers in front of the letters called?

• Variables

• Coefficients

• Constants

• Expressions

If a=3, and b= -1, then (ab)² =

• -3

• -9

• 3

• 9

If p=2 and q= -5, then pq=

• 10

• -10

• 7

• -7

If x= -3, y=4 and z= 1, evaluate 2x + 3y -5z

• -1

• 13

• -13

• 1

Work out the value of the following expressions when a = 3, b = 4 and c = 5.
2a² + c²   

• 22
• 34
• 68
• 43