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Home > PC > Chapter 12 > Lesson 12.1.3 > Problem 12-30


Think about how you would write an equation for each sentence.
What would your system of equations look like?
How could you write your system as a matrix equation instead?

Where x = cost of 1 pencil, y = cost of 1 pen, z = cost of 1 eraser.

Solve for x, y, and z using your calculator.See problem 12-19 if you need more help.