Question 800556
let x be the number of 5 cent stamps and y be the number of 23 cent stamps, then
x = 4y+2
so x is the number of 5 cent stamps and (x-2)/4 is the number of 23 cent stamps 
we also know that
.05x +.23y = 4340
is $4340 correct????????????????????? ***** corrected value $4.40
now we can substitute for x
.05*(4y+2) +.23y = 4.40
.2y +.1 +.23y = 4.40
subtract .10 from both sides of =
.43y = 4.30
y = 10
x = 4 *10 + 2
x = 42