How do you solve and check your solution given #-0.4y=2#?

1 Answer
Oct 2, 2017

Answer:

#y=-5#

Explanation:

We know that #-0.4y=2#
We multiply both sides by #10#:

#-0.4ycolor(blue)*color(blue)10=2color(blue)*color(blue)10#
Simplify:
#-4y=20#
Divide both sides by #-4#

#(-4y)/(-4)=20/(-4)#
Simplify:
#y=-5#

Let's check.

#y=-5#

#-0.4y=2#

#-0.4*y=2#

#-0.4*-5=2#

The equation is true.
So, the answer is #y=-5#.