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

To find the value of b, we can substitute the values of x and y from point A into the equation y = 1.4x + b.

Substituting x = -4 and y = 10, we have:

10 = 1.4(-4) + b

10 = -5.6 + b

Adding 5.6 to both sides of the equation:

10 + 5.6 = b

b = 15.6

So, the value of b is 15.6.