Question 462652
Plot years on the horizontal and
life expectancy on the vertical.
Using the point-slope formula,
{{{ ( E - 65.4 ) / ( t - 0 ) = ( 69 - 65.4 ) / ( 6 - 0 ) }}}
Multiply both sides by {{{ 6t }}}
{{{ 6*( E - 65.4 ) = 3.6*t }}}
{{{ 6E - 392.4 = 3.6t  }}}
{{{ 6E = 3.6t + 392.4 }}}
{{{ E = .6t + 65.4 }}}
check answer:
1990:
{{{ 65.4 = .6t + 65.4 }}}
{{{ .6t = 0 }}}
{{{ t = 0 }}} (or 1990)
1996:
{{{ 69 = .6t + 65.4 }}}
{{{ .6t = 3.6 }}}
{{{ t = 6 }}} (or 1996)
OK