Angelica solves the system { x + y = -3. x - y =1 } and finds the solution ( 1, 3 ). Use substitution to explain whether Angelica’s solution is correct.

Angelica solves the system { x + y = -3.

x - y =1 } and finds the solution ( 1, 3 ). Use substitution to explain whether Angelica’s solution is correct.

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