A. What does the equation x=4 represent in R2? Whatdoes it represent in R3? Illustrate with sketches.

b. What does the equation y=3 represent in R3? Whatdoes z=5 represent? What does the pair of equations y=3 and z=5? Inother words, describe the set of points (x, y,z) such that y=3 andz=5. Illustrate with a sketch.

The first attached diagram is for the two dimensional graph

Where the two dimensional graph of x=4 is vertical line containing the coordinates of (4,0)

Second image attached is the three (3) dimensional Coordinate of x=4 is the vertical plane containing the line x=4 in xy-plane

19.side- angle- side

20. angle- side- angle

step-by-step explanation: