14.23n - 15 = 41.92
Explanation :
In mathematics "n" denotes any non-negative integer
as in this case "n" denotes the number of necklaces Christine bought
If 1 necklace costs $14.23
n no. of necklaces costs $14.23 × n = 14.23n
She used a coupon for $15 off
so the total amount spent
= the cost for n no. of necklace – $15
= 14.23n – 15
that's technically how the equation given in the question has been derived
total amount spent = $41.92 ( stated in question )
previously we derived an equation for the total amount spent which is = 14.23n – 15
14.23n - 15 = 41.92
14.23n = 41.92 + 15
14.23n = 56.92
n = 56.92 / 14.23
n = 4
no. of necklaces bought = n = 4 necklaces
hope this helped :)
