Substitution in Algebra

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

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• 36

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• 37

If s = 3 & t = 9, what is 2t - 3s?

• 8

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• 11

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

• 5

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• 8

• 10

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

• 10

• 12

• 15

• 36

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

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• 9

• 6

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

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

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• 12

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when n= 8, 10 + 3n is,

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• 24

• 38

If x = 3,

calculate x + 3

• 3x

• 6

• 6x

• 3

if x = 4,

calculate 2x + 5

• 9

• 13

• 13x

• 8x + 5