Algebra 2 need help, please dont bid more than $5

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Algebra 2 need help, please dont bid more than $5

A student solves the system of equations given below. In which line is an error first made? 2x -­ y = 6 2x + y = 10 
Line 1  2x -­ y = 6   – ­2x + y = ­10 
Line 2  0 = ­4 
Line 3  0 ≠-4 so there is no solution

a. Line 1

b. Line 2

c. Line 3 

d. Line 4