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anonymous
 5 years ago
John is twice as old as Mary. The sum of their ages is 21. How old is Mary?
Let J = John's age and M = Mary's age. Select the system equations that represents the problem.
a)J  2M = 0
b)M  2J = 0
c)J + M = 21
d)J = M + 2
There can be more than one answer :)
anonymous
 5 years ago
John is twice as old as Mary. The sum of their ages is 21. How old is Mary? Let J = John's age and M = Mary's age. Select the system equations that represents the problem. a)J  2M = 0 b)M  2J = 0 c)J + M = 21 d)J = M + 2 There can be more than one answer :)

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shadowfiend
 5 years ago
Best ResponseYou've already chosen the best response.0So first off, is there an equation that expresses that the sum of the ages is 21?

bahrom7893
 5 years ago
Best ResponseYou've already chosen the best response.0J = 2M=> =>J  2M = 0 J + 2M = 21 (sum of both is 21) So: J  2M = 0 J+2m = 21
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