Question 875427
Three points are (1990, 250), (1995, 175), (2005, y).


The first two points define the linear relationship:
{{{m=(175-250)/(1995-1990)}}}
{{{m=-75/5}}}
{{{m=-15}}}
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{{{y=mx+b}}}
{{{b=y-mx}}}
{{{b=175-(-15*1995)}}}
{{{b=30100}}}
{{{highlight_green(y=-15x+30100)}}}
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Find y for x=2005:
{{{highlight(y=-15*2005+30100)}}}