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