another math question


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If x and y are positive integers, for which of the following ordered pairs (x,y) will the value of 9x-8y be least?

[A] (1,1)

(2,1)

[C] (3,2)

[D] (5,3)

[E] (8,9)

I want someone to explain why it is E and not A, please :D

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If x and y are positive integers, for which of the following ordered pairs (x,y) will the value of 9x-8y be least?

[A] (1,1)

(2,1)

[C] (3,2)

[D] (5,3)

[E] (8,9)

I want someone to explain why it is E and not A, please :D

[A] (1,1)

9(1) - 8(1) = 1

[E] (8, 9)

9(8) - 8(9) = 0

0 < 1

QED

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