Question 1122885
Plot wages, {{{ y }}} on the vertical axis
Plot sales, {{{ x }}} on the horizontal axis
Let the form of the equation be {{{ y = m*x + b }}}
{{{ m = ( 950 - 810 ) / ( 3500 - 2800 ) }}}
{{{ m = 140 / 700 }}}
{{{ m = .2 }}}
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Now I have {{{ y = .2x + b }}}
Find {{{ b }}}
{{{ 810 = .2*2800 + b }}}
{{{ 810 = 560 + b }}}
{{{ b = 250 }}}
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Now I have:
{{{ y = (1/5)*x + 250 }}}
{{{ 5y = x + 1250 }}}
In standard form:
{{{ x - 5y + 1250 = 0 }}}
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Check:
( 3500, 950 )
{{{ 3500 - 5*950 + 1250 = 0 }}}
{{{ 4750 - 4750 = 0 }}}
OK