Question 1127446
You are given 2 points:
( 80, -360 )
( 200, 600 )
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Use general point-slope formula
{{{ ( y -(-360) ) / ( x - 80 ) = ( 600 -(-360) ) / ( 200 - 80 ) }}}
{{{ ( y + 360 ) / ( x - 80 ) = 960 / 120 }}}
{{{ y + 360 = 8*( x - 80 ) }}}
{{{ y + 360 = 8x - 640 }}}
{{{ y = 8x - 1000 }}}
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{{{ 600/200 = 3 }}}
They made $3 profit/calendar
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If {{{ x=0 }}}, ( no calendars sold ),
they lose $1000 since
{{{ y = 8*0 - 1000 }}}
{{{ y = 1000 }}}