### Home > CCA2 > Chapter 8 > Lesson 8.3.1 > Problem 8-128

8-128.

Given the equation: 3

*x*+*y*−*z*= 6. Homework Help ✎Draw a graph.

Is (1, 2, −1) on the graph? Justify your answer.

Notice that there are three variables. Find the three intercepts.

Does the point make the equation true?

Yes, it is a solution to the equation.