Question 1102168
The description illustrates two linear points, (18,1999) and (50,2175).  The two points are to fit on a line.


The line's equation can be found function formed, and the value evaluated for 60 gallons of fuel;
OR
Extrapolation can be used.


.
<pre>
FUEL        WEIGHT
18           1999
50           2175
60            ?
</pre>


{{{(60-50)/d=(50-18)/(2175-1999)}}}

{{{d/10=176/32}}}

{{{d=1760/32}}}

{{{d=55}}}

Weight for 60 gallons:   {{{2175+55=highlight(2230)}}} {{{pounds}}}.




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If solve using linear equation
known point (50,2175)
{{{y-2175=((2175-1999)/(50-18))(x-50)}}}, {{{point-slope-form}}}
{{{highlight_green(y=5.5x+1900)}}}
Let x=60, find y=2230