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I have posted a link there to this thread so the OP can view my work.Calculus 3 Lagrange multipliers help?

Okay I CANNOT figure out lagrange multipliers. Can anyone help me with my homework problems? Thanks!

1.

Use Lagrange multipliers to find the indicated extrema, assuming that x and y are positive.

minimize f(x,y)= x^2 + y ^2

constraint: x+ 2y - 20 = 0

2.

Use Lagrange multipliers to find the indicated extrema, assuming that x and y are positive.

Maximize f(x,y) = (99 - x^2 - y^2)^(1/2)

constraint: x + y - 10 = 0