In this Problem, you need
to know about the symbol ‘|a|’, that means the ‘absolute’, or positive,
value of the number a.
So, for example, |-5| = |5| = 5.
How many pairs of integer values of x and y can you find to satisfy both
these equations simultaneously ?:
|x| + |y| = 3
|x - y| = 3
B And these two ?
|x + y| = 4
|x - y| = 8
C What difference now ?
|x + y| = 8
|x - y| = 4
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