In which line is a mistake first made when solving the following system of equations by elimination for x? 5x + 3y = 12 4x - 5y = 17
Line 1
25x + 15y = 60
4x - 5y = 17
Line 2
25x + 15y = 60
20x - 15y = 85
Line 3
45x = 145
Line 4
x = 29/9
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