1)0,7×(x)-10=-5,1 2)-0,25×(y)+3,5=5 3)-5,6×(x)+9=-5

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Sure, let's solve the system of equations:

1) 0.7x - 10 = -5.1
Add 10 to both sides:
0.7x = 4.9
Divide by 0.7:
x = 7

2) -0.25y + 3.5 = 5
Subtract 3.5 from both sides:
-0.25y = 1.5
Divide by -0.25:
y = -6

3) -5.6x + 9 = -5
Add 5 to both sides:
-5.6x = 4
Divide by -5.6:
x = -0.7143

So the solutions to the system of equations are x = 7, y = -6, and x = -0.7143.