Chapter 10, Problem 48RE

For Exercises 46-48, assume that the $x\text{-}$ and $y\text{-axes}$ are rotated through angle $\theta$ about the origin to form the $x\text{'}\text{-}$ and $y\text{'}\text{-axes}$ .

Given $\theta =45°,$ write the equation $xy+10=0$ in $x\text{'}y\text{'}\text{-coordinates}$ .