SOLUTION: Ellie is twice as old as her sister Kate. In seven years the sum of their ages will be 20. Write a system of equation for this.

Algebra ->  Coordinate Systems and Linear Equations -> SOLUTION: Ellie is twice as old as her sister Kate. In seven years the sum of their ages will be 20. Write a system of equation for this.      Log On


   

Question 871873: Ellie is twice as old as her sister Kate. In seven years the sum of their ages will be 20.
Write a system of equation for this.
Answer by josgarithmetic(39617) About Me  (Show Source):