Question

four pencils and five pens costs $2.00, three pencils and four pens costs $1.58 Find the cost of a pencil and the cost of a pen

Answer 1

x = pencil; y = pen



4x + 5y = 2
y=2-4x//5
...................

3x + 4y = 1.58

3x + 4(2-4x//5) = 1.58

3x+ 8/5 -16x/5 = 1.58

15x/5 -16x/5 = 1.58 - 8/5

-x/5 = 1.58 - 8/5

x = -5(1.58 - 8/5)

Answer 2

pencils = -7.90+8 = .10

Answer 3

y=2-4x//5

y=2-4(.10)//5

y = 10/5 - .40/5 = 9.60/5 = 1.92

pens = 1.92

Answer 4

or not lol

Answer 5

pencil = .40

pen = .32

had the right eqautions, but forgot how to divide....