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Lindsay is 5 years younger than Mark. Seven years ago, the sum of their ages was
31.
let l be Lindsay's age and let m be Mark's age.Which system of equations represents this situation?


l−7=(m−7)+5
l+m=31




l=m+5

(l−7)+(m−7)=31




l−7=(m−7)−5

l+m=31



l=m−5

(l−7)+(m−7)=31

 Apr 10, 2020
 #1
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Let Lindsay's age = L

           Mark's age = M

 

Lindsay is 5 years younger than Mark:  L  =  M - 5

 

Seven years ago the sum of their ages was 31:  (L - 7) + (M - 7)  =  31

 Apr 10, 2020

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