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Math Multiple Choice

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If X is an even integer and y is also an even integer, which of the following is an even integer?

A x + y -1
B x + 3y+3
C 4x + 6y
D 2(x +3y)-1
E 2xy – 7

The correct answer is .
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x= even integer and y = even integer

C) 4x +6y the answer should always be an even integer because multiplying an even number to any integer will be even. Since 4 and 6 are even, 4x and 6y should be even. Also, an even integer plus even integer should always be even.