Question 682787
First get it into the form {{{ y = m*x + b }}}
where {{{ m }}} = slope and {{{ b }}} = y-intercept
given:
{{{ y - 16 = -4x }}}
Add {{{ 16 }}} to both sides
{{{ y = -4x + 16 }}}
This is now in the slope-intercept form
The slope is {{{ m = -4 }}} 
The y-intercept is {{{ b = 16 }}}