Answer:
I don't understand
Step-by-step explanation:
but hope u will understand
Answer : Option A
Explanation:
we can clearly see that from x+ y=5 we can substitute y = 5-x in y = 9x^2
Option B is clearly incorrect x can not be y -5
Option C is incorrect because y can not be 5 +x
Option D is incorrect because its y = 9x^2 not y^2 =9x^2 so y can not be 3x
if its y^2 = 9x^2 then only implies y = 3x
$21 would be the price of all three necklaces. But you need only 1 necklace so divide by 3, and the answer is $7.
