I need help understanding this problem:
Tyrel and Dalia bought some pens and pencils. Tyrel bought 4 pens and 5 pencils, which cost him $6.71. Dalia bought 5 pens and 3 pencils, which cost her $7.12. Let a equal the price of a pen. Let b equal the price of a pencil.
a.Write an equation that relates the number of pens and pencils Tyrel bought and the amount he paid for them.
b.Write an equation that relates the number of pens and pencils Dalia bought and the amount she paid for them.
c.Solve the systems you wrote for parts (a) and (b) to find the price of a pen and the price of a pencil.
Thanks for helping!