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Mathematical straight line of college entrance examination and its equation
Assuming the origin, the straight line is y=-x/2.

But the origin, let the equation be x/a+y/b= 1.

2/3b- 1/b= 1

b=- 1/3

a=- 1

At this time, the equation is -x-3y= 1.

So to sum up, the equation is x+2y=0 or x+3y+ 1=0.