Chapter 13 - Vector Geometry - 13.5 Planes in 3-Space - Exercises - Page 685: 47

$$-x =4.$$

Work Step by Step

To obtain the trace of the plane in the $xz$-plane, we set $y=0$ and hence $$-x =4.$$ So the line $-x =4$ is the trace of the plane $-x+y=4$ in the $xz$-plane.

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