Tyrel and Dalia bought some pens and pencils. Tyrel bought 4 pens and 5 pencils,
which cost him Php 80. Dalia bought 5 pens and 3 pencils, which cost her Php 64.
Let a equal to the price of a pen. Let b be equal to the price of a pencil.
a. Write an equation that relates the number of pens and
pencils Tyrel bought to the amount he paid for them
b. Write an equation that relates the number of pens and
pencils Dalia bought to the amount she paid for them.
c. Solve the system you wrote for parts (a) and (b) to find the
price of a pen and price of a pencil.
You may refer to the given examples as you answer each activity.

pwede pasagot ​