Question

A university bookstore recently sold a wirebound graph-paper notebook for $2.15, and a college-ruled notebook for $3.43. At the start of spring semester, a combination of 50 of these notebooks were sold for a total of $134.38. How many of each type were sold?

Answer 1

i want to know if my work write

Answer 2

W+C=50
2.15W+3.43C=134.38


C=50-W

2.15W+3.43(50-W)=134.38

2.15W-3.43W=134.38-171.5

-1.28W=-37.12

W=29

C=50-29=21

W=29
C=21

Answer 3

w + c = t
wx + cy = T ; eliminate one of the variables

-wx -cx = -tx
wx +cy = T
-------------
c(y-x) = T-tx

c = (T-tx)/(y-x)

c = (134.38 - 50(2.15))/(3.43-2.15) = 21

your right

Answer 4

ty