Solve the following system of equations for all three variables. 7x + 9y – 2z = 9
X – 9y – z = -3
- 8x – 9y + 5z = 6

If anyone can help me solve this and teach me how to do three variable equations that would be great :)

Thomas is using a drawing program to complete a construction. which construction could he be completing? two perpendicular lines are drawn. inscribing an equilateral triangle in a circle inscribing a square in a circle inscribing a regular pentagon in a circle inscribing a regular hexagon in a circle