contestada

Allison went back to school shopping with her three children. The first child needed three notebooks, four pencils, and two pens for a total of $5.45. The second child needed 5 notebooks, two pencils, and three pens totaling $7.80. Her last child needed two notebooks, five pencils, and for pens for a total cost of $5.15. Find the cost of each item.

Respuesta :

mrinconj
Write an equation system where x=cost of notebook, y=cost of pencil, z=cost of pen.
3x+4y+2z=5.45
5x+2y+3z=7.80
2x+5y+4z=7.15
Solve this system and you get x= $1.25 per each notebook, y= $0.25 per each pencil, z= $0.35 per each pen