The Temperature at a Point $( x , y )$ Of a Flat Metal Plate Is

question 64

Essay

The temperature at a point $( x , y )$ of a flat metal plate is $T ( x , y ) = 9 x ^ { 2 } + 16 y ^ { 2 }$ where $T ( x , y )$ is measured in degrees. Draw the isothermals for $T ( x , y ) =$ 0, 9, 16, and 144 degrees.

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