Answer:
the solution is (5, -6)
Step-by-step explanation:
Let the numbers be x and y. Then x + y = -1 (meaning that either x or y is negative), and x - y = 11.
Solve the system:
x + y = -1
x - y = 11
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2x = 10, or x = 5. If x = 5, then x - y = 11 becomes 5 - y = 11, or y = -6.
Then the solution is (5, -6).
Is the sum of 5 and -6 equal to -1? YES.
If -6 is subtracted from +5, is the difference 11? Yes.
