What is the most appropriate substitution equation in order to solve the equation (x+2y-1)dx+3(x+2y)dy=0?   u=1+2dy   u=vx   u=x+2y-1   u=x+2y

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A:

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Equations and Inequations

Equations and inequalities describe the relationship between two mathematical expressions.

Linear Functions

A linear function can just be a constant, or it can be the constant multiplied with the variable like x or y. If the variables are of the form, x2, x1/2 or y2 it is not linear. The exponent over the variables should always be 1.