Answer: A) 3(10 - 5y) + 6y =12
Step-by-step explanation:
As per the question , the given system of linear equation :

Here , To solve the system of equations using substitution , Johanna isolates x in the second equation and writes

As per the substitution method , the next step is to substitute the isolated value of 'x' in first equation , thus the next step will become

Hence, the correct option is A) 3(10 - 5y) + 6y =12
Y-(-7)=-9(x-6)
Y+7= -9x+54
Subtract 7 from both sides
Y= -9x+47
Answer:
$2.44/gal
Explanation:
$58.56/24gallon/