Lagrange’s method : Solve (y+z)p+(x+z)q=x+y

A first order partial differential equation f(x, y, z, p, q) = 0 is known as quasi-linear equation, if it is linear in p and q, i.e., if the given equation is of the form P(x, y, z) p + Q(x, y, z) q = R(x, y, z).

Steps for solving Pp + Qq = R by Lagrange’s method.
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Видео Lagrange’s method : Solve (y+z)p+(x+z)q=x+y канала Manimaran J