Question 427050
Let {{{S}}} = sales for the year
Let {{{t}}} = the year
Plot Sales on the vertical axis and the year on the horizontal
You are given a point (2000,14.7) for company A.
I'll call it (0,14.7)
The rate of increase, or slope is {{{ 2.1 }}} millions/year
To get the equation:
{{{ ( S - 14.7) / ( t - 0 ) = 2.1 }}}  (in millions)
{{{ S - 14.7 = 2.1t }}}
{{{ S = 2.1t + 14.7 }}}
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For company B, the point is (0,19.4),
 and the slope is {{{ 1.7 }}} millions/year
{{{ (S - 19.4) / (t - 0) = 1.7 }}}
{{{ S - 19.4 = 1.7t }}}
{{{ S = 1.7t + 19.4 }}}
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To find where the lines intersect (equal amount of sales),
Subtract B's equation from A's
{{{ S = 2.1t + 14.7 }}}
{{{ -S = -1.7t - 19.4 }}}
{{{ 0 = .4t - 4.7 }}}
{{{ .4t = 4.7 }}}
{{{ t= 11.75 }}}
If the data is year-end data, then this figure means
9 months into 2012, or September 2012
Hope I got it right