Highest common factor

The highest common factor of 56 and 72 can be expressed as 56 x + 72 y 56x + 72y , where x x and y y are integers. Which of the following could be the possible values of x x and y y ?

x=4 and y=-3 x=4 and y=3 x=-3 and y=4 x=-4 and y=-3

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