To be able to write the equation of a line in standard form. In particular, our book would not have cleared the fraction.
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By using Cartesian equations for circles on the Cartesian plane
y=x2 and y=lnx are two examples of nonlinear equations.
Standard form can have two meanings in mathematics. One is the standard form of linear equations, where the terms are written as Ax + By = C, and the other is a reference to scientific notation.
I suggest that the simplest way is as follows:Assume the equation is of the form y = ax2 + bx + c.Substitute the coordinates of the three points to obtain three equations in a, b and c.Solve these three equations to find the values of a, b and c.
Addition and subtraction are mathematical processes. They can be used in equations, which are statements that the values of two mathematical expressions are equal, but they are not equations by themselves.