Problema Solution
Brett and Howard bought some pens and pencils. Brett bought 4 pens and 5 pencils, which cost him $6.71. Howard bought 5 pens and 3 pencils, which cost him $7.12. What is the cost of a pen and a pencil.
Answer provided by our tutors
let
x = the cost of a pen
y = the cost of a pencil
Brett bought 4 pens and 5 pencils, which cost him $6.71
4x + 5y = 6.71
Howard bought 5 pens and 3 pencils, which cost him $7.12
5x + 3y = 7.12
by solving the system of equations
4x + 5y = 6.71
5x + 3y = 7.12
we find
x = $1.19
y = $0.39
click here to see the step by step solution of the system of equations
the cost of one pen is $1.19.
the cost of one pencil is $0.39.