Question 1107281
Ordered pair data points  (x,y) using x for number bicycles and y for cost,

(120, 10400) and (140, 11200).


y=mx+b  will have m slope as the cost per bicycle and fixed cost as b, vertical axis intercept.


{{{m=(11200-10400)/(140-120)}}}

{{{m=800/20=80/2}}}

{{{m=40}}}-----marginal cost per bike

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{{{y=mx+b}}}
{{{b=y-mx}}}
{{{b=10400-40*120}}}
{{{b=10400-4800}}}
{{{b=5600}}}-------fixed cost

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{{{highlight(y=40x+5600)}}}-------cost y of producing x bicycles.