Question 1136241


{{{y = mx + b }}}

The coordinates in the graph are ({{{4}}}, {{{1500}}}) and ({{{8}}}, {{{3900}}})

use given coordinates to calculate slope {{{m}}}

{{{m=(y[2]-y[1])/(x[2]-x[1])}}}

{{{m=(3900-1500)/(8-4)}}}

{{{m=2400/4}}}

{{{m=600}}}


so far we have 

{{{y = 600x + b }}}........use one poine to calculate {{{b}}}


{{{1500 = 600*4 + b }}}

{{{b=1500 - 600*4  }}}

{{{b=1500 - 2400  }}}

{{{b=-900 }}}


and, your equation is: {{{y = 600x -900 }}}