If two integers have the same parity, then their sum is even. (Try cases.)
Added by Heather M.
Step 1
Let's say we have two even integers, x and y. We can write them as x = 2a and y = 2b, where a and b are integers. Then their sum is: x + y = 2a + 2b = 2(a + b) Since a + b is also an integer, we can write the sum as 2c, where c = a + b. Show more…
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