SOLUTION: Hello thanks in advanced. In which line is a mistake first made when solving the following system of equations by substitution? 2x - y = -4 3x + y = -9 Line 1 2x - y =

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Question 1014974: Hello thanks in advanced.
In which line is a mistake first made when solving the following system of equations by substitution?
2x - y = -4
3x + y = -9


Line 1
2x - y = -4
y = 3x - 9
Line 2
2x - (3x - 9) = -4
Line 3
2x - 3x + 9 = -4
Line 4
-1x + 9 = -4
Line 5
-1x = -13
Line 6
x = 13
Answer by rothauserc(4718)   (Show Source): You can put this solution on YOUR website!
Line 1
y = 3x -9 should be y = -3x -9
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