# Calculus

Find the domain of the following function h(x,y) = sqrt(x-9y+5)?

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1. Since sqrt(x) requires x≥0, therefore the domain of the function is such that:
x-9y+5≥0
equivalently:
9y≤x+5
or
dom h(x,y) = {x,y ∈ℝ | 9y≤x+5}

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