Explain your answer !

( WILL GIVE BRAINLST)

You can set up two equations to solve for this. I will set apple as “a” and juice as “j”
Ricky: a + j = 3
Noel: 3a + j= 7
From here, you can solve this system of equations using substitution. I will solve Ricky’s equation for A.
a + j = 3
a = 3 - j
and then you take this and substitute that answer for a in Noel’s equation.
3a + j = 7
3(3 - j) + j = 7
9 - 3j + j = 7
9 - 2j = 7
-2j = -2
j = 1
Juice costs $1 (answer A)