Evaluate Algebra Expressions and Substitution

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

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

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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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Evaluate the expression for the given values. 5x - 3y + 2z

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

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

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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.
2a² + c²   

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