in helmholtz vector equation why F=-∆ф+∆xA?
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The graph (on Cartesian coordinates) of a quadratic equation is a parabola.
Subtract the equation of one line from the equation of the other
By substitution
The coordinates of every point on the graph, and no other points, are solutions of the equation.
-4x + 9y = 0 is the equation of a line in the Cartesian plane and the coordinates of any of the infinite number of points on that line will satisfy the equation.