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.
Add 10 to both sides
0.7x = 4.
Divide by 0.7
x = 7

2) -0.25y + 3.5 =
Subtract 3.5 from both sides
-0.25y = 1.
Divide by -0.25
y = -6

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

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