Answer
$-2.4$
Work Step by Step
First, we simplify the expression by combining like terms:
$-7x+4y+6x-9y+x-y$
=$(-7x+6x+x)+(4y-9y-y)$
=$(-x+x)+(-5y-y)$
=$0+(-6y)$
=$-6y$
Now, we substitute $y=0.4$ into the expression:
$-6y=-6(0.4)=-6\times\frac{4}{10}=-\frac{24}{10}=-2.4$
