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Mathematics, 27.06.2019 14:00 sjjarvis4806

Pls with in which line is a mistake first made when solving the following system of equations by substitution? 2x - y =-4 3x + y = -9line 1: 2x -y = -4y= 3x-9line 2: 2x-(3x-9)=-4 line 3: 2x-3x+9=-4line 4: -1x + 9 = -4line 5: -1x = -13line 6: x = 13

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