If $\frac{a}{a_1}=\frac{b}{b_1}$,then the substitution to be used to solve the differential equation $\frac{dy}{dx}=\frac{ax+by+c}{a_1x+b_1y+c_1}$ by using separation of variables is

  • A
    $x=X+h, y=Y+k$
  • B
    $ax+by=z$
  • C
    $y=V(x) \cdot x$
  • D
    $x=at, y=bt$

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