a=-5.4 and b=-3.8

-6b+a

-6(-3.8) + (-5.4) = 22.8 + (-5.4) = 17.4

To evaluate the expression -6b + a, substitute the values of a and b into the expression.

Given:

a = -5.4
b = -3.8

Substitute these values into the expression:

-6(-3.8) + (-5.4)

Perform the multiplication first:

22.8 + (-5.4)

Simplify the addition:

22.8 - 5.4 = 17.4

So, -6b + a evaluates to 17.4.