Question 1010801
Plot cost, {{{ C }}}, on the vertical axis and
number of jackets, {{{ n }}} on the horizontal
axis. You are given 2 points, ( n, C ):
( 180, 5340 )
( 400, 8200 )
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Use the general point-slope formula:
{{{ ( C - 5340 ) / ( n - 180 ) = ( 8200 - 5340 ) / ( 400 - 180 ) }}}
{{{ ( C - 5340 ) / ( n - 180 ) = 2860 / 220 }}}
{{{ ( C - 5340 ) / ( n - 180 ) = 13 }}}
{{{ C - 5340 = 13*( n - 180 ) }}}
{{{ C - 5340 = 13n - 2340 }}}
{{{ C = 13n + 3000 }}}
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check answer:
( 180, 5340 )
{{{ C = 13n + 3000 }}}
{{{ 5340 = 13*180 + 3000 }}}
{{{ 5340 = 2340 + 3000 }}}
{{{ 5340 = 5340 }}}
OK
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You can check ( 400, 8200 )
Also they want to use x and y, so
{{{ n = x }}} and {{{ C = y }}}