<u>Definitions of the variables in the situation:</u>
J = Jana's age
S = Sister's age
<u>The Equation:</u>
J + 8 = S
Step-by-step explanation:
<u>Explanation: </u>
In the equation we will use the variable J for Jana and S for Janna's sister. Since we know Jana's age plus 8 equals her sister's age, the equation will be J + 8 = S