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Angie was given the system of equations. Angie’s work is shown in the table.
7x+y=−12
7x+4y=−6
Where did Angie make an error? Justify your answer.
Step 1; because she should have multiplied the second equation by -1.
Step 2; because she should have eliminated the y-value.
Step 3; because she used substitution incorrectly.
Step 4; because the solution is (2,-26).
