Algebra: Substitution

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

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

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

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

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

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

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If a = 4 & b = 6, what is 3a + 5b?

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3x + 7y

What are the numbers in front of the letters called?

• Variables

• Coefficients

• Constants

• Expressions