Algebra Substitution

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

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

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Work out the value of the expression when x = 3, y = – 2 and z = – 4.
2x² + z²   

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

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

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If a=6 and b= 7,find the value of 15-a-b

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If a=4,b=5 and c=6,find 2c-a-b

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When x = 3, y = 6 and z = 7, find 2x - z

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

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