Multivariable calculus question:
find an equation of the straight line tangent, at the given point, to the level curve of the given function passing through that point.
f(x, y) = at (2, -1)
!

Anyone know? is appreciated! will mark brainliest if correct!

(mc 02.03) what set of reflections and rotations would carry rectangle abcd onto itself? reflect over the y-axis, reflect over the x-axis, rotate 180° rotate 180°, reflect over the x-axis, reflect over the line y=x reflect over the x-axis, rotate 180°, reflect over the x-axis rotate 180, reflect over the y-axis, reflect over the line y=x

Standard deviation of 19,29,21,22,23