Question 902081
Identify two points.
(0,212) and (1100,210).


Slope, {{{m=(210-212)/(1100-0)=-2/1100=highlight_green(-(1/550))}}}

{{{y=mx+b}}}
{{{b=y-mx}}}
{{{b}}}=....  the y intercept is already found as given.


{{{highlight(y=-(1/550)x+212)}}}


{{{graph(400,400,-10,1500,200,220,-x/550+212)}}}


A view from farther away,
{{{graph(400,400,-10,1500,-10,220,-x/550+212)}}}


For boiling point at 11000 feet, just set x=11000 and evaluate y.