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Value of an Expression

If x=1, y=-1,...

Question

If x = 1, y = -1, then the value of 5x - 4y is

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Solution

The correct option is C 9
5x - 4y,
substitute the value of x = 1 and y = -1 in the above expression, we get,
= 5(1) - 4(-1)
= 5 + 4
= 9

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