Y=-1,4x+b, A (-4;10)

To find the value of 'b', we can substitute the coordinates (-4,10) into the equation y = -1.4x + b.

So, substituting -4 for x and 10 for y, we have:

10 = -1.4(-4) + b

10 = 5.6 + b

Subtracting 5.6 from both sides:

10 - 5.6 = b

4.4 = b

Therefore, the value of 'b' is 4.4.