The area of the region bounded by the curve 9x2 + 4y2 - 36 = 0 is
D.
The given equation of curve is 9x2 + 4y2 - 36
The general solution of the differential equation (2x - y + 1)dx + (2y - x + 1) dy = 0 is
x2 + y2 + xy - x + y = c
x2 + y2 - xy + x + y = c
x2 - y2 + xy - x + y = c
x2 - y2 - xy + x + y = c