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Given a parabola with a leading coefficient of 2 and a vertex at the point 
.
Write down the vertex and general form of the parabola.
If point A is the intersection of the parabola with the ordinate axis. Write down three forms of the equation of the line passing through point A and is parallel to the bisectors of the even quadrants.
and the general form is 
.
, in implicit form is 
and in intercept form is 
.
