Question 119689
{{{y = mx + b}}}
{{{b}}} = fixed cost, so, {{{b = 40}}}
{{{m}}} = variable cost, so, {{{m = 10}}}
{{{y = 10x + 40}}}
Here's the graph:
{{{ graph( 600, 600, -10, 40, -5, 300, 10x + 40) }}}