Answer :
A. e=v+9 because if Victor is 6 then it would be 6+9= 15 (Evelyn's Age)
Since e represents evelyn ege, hence the equation that tells you how to find Evelyn's age if you know Victor's age is e = v + 9
System of equations
These are equation containing unknown variables
If Evelyn was 9 when her brother Victor was born, hence;
Victors age = v
Evelyn age = v + 9
Substitute both equations
Since e represents evelyn ege, hence the equation that tells you how to find Evelyn's age if you know Victor's age is e = v + 9
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