Solve the following ODEs by making an appropriate change of variable: 1-3y - 9x (a) (y² − x²) dy -2ry, (b) dr 1+ y + 3x dy dz =

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Q: Solve the following ODEs by making an appropriate change of variable: dy 1-3y-9r (b) = dr 1+ y + 3x…

A: