Answer
The solution is between -4 and -5.
Work Step by Step
$\ \ \underline y\ \ \ \ \underline{1.5-0.4y}$
$-1\ \ \ \ \ \ 1.9$
$-2\ \ \ \ \ \ 2.3$
$-3\ \ \ \ \ \ 2.7$
$-4\ \ \ \ \ \ 3.1_\longrightarrow$ the solution is between -4 and -5
$-5\ \ \ \ \ \ 3.5$
