Question 994020
The point where the two graphs meet is the year, if one looks at t.
-31.8t +322=428.8t + 110
460.6 t= 212
t=0.460.  This would be in mid-1990.  I wonder if the numbers were copied correctly, but with those equations, that is the value.


{{{graph(300,200,-10,10,-50,2000,-31.8x+322,428.8x+110)}}}