0.1x + 0.9y = -7.4
multiply throughout by 8: 0.8x + 7.2y = -59.2
Subtract second equation from this: 7.6y = -68.4 so that y = -9
Substitute this value of y in the first equation: 0.1x - 8.1 = -7.4
so that 0.1x = 0.7 or x = 7
Solution: (x,y) = (7,-9)
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