We have to solve
-2x - y = -9 ...(1)
5x - 2y = 18 ...(2)
2*(1) - (2)
=> -4x - 2y - 5x + 2y = -18 - 18
=> -9x = -36
=> x = 4
substitute in (1)
-2x - y = -9
=> y = -2*4 + 9
=> y = 1
The solution of the system of equations is (4, 1)
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