Question 1069842
Here's a graph:
{{{ graph( 600, 600, -200, 200, -12000, 4000, 80x - 7500 ) }}}
{{{ d(m) = -7500 + 80m }}}
The graph is easy to make
Pick a value for {{{ m }}}, like m = 0, 10, 20, 30, 40, 50, etc
Find {{{ d(m) }}} for each pick
For instance:
{{{ m = 50 }}}
{{{ d(50) = -7500 + 80*50 }}}
{{{ d(50) = -7500 + 4000 }}}
{{{ d(50) = -3500 }}}
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Note that {{{ d(m) = 0 }}} gives me
{{{ 0 = -7500 + 80m }}}
{{{ 80m = 7500 }}}
{{{ m = 93.75 }}}
This is {{{ m }}} for sea level
Any value of {{{ m }}} greater than {{{ 93.75 }}}
and likewise, any {{{ d(m) }}} greater than {{{ 0 }}} is
meaningless since a submarine can't fly