Posted by Sarah on Wednesday, December 29, 2010 at 4:30pm.
this december your brother jack will be 2 years from being twice as old as your sister Jen. the sum of jacks age and three times jens age is 68. how old is jen?

Algebra  TutorCat, Wednesday, December 29, 2010 at 7:30pm
Jack's age=2*(Jen's age)2
[Jack's age]+3*(Jen's age)=68
use substitution method:
[2*(Jen's age)2]+3*(Jen's age)=68
Solve for Jen's age.

Algebra2  elizabeth, Thursday, December 30, 2010 at 1:37am
how to solve a matrice when it's like b21 and it givec you to sets of matrices like AND IT SAYS TO ID EACH ELEMENT
A.)O 1 B.)6 3 1/2
1.5 3 AND
7 2

Algebra  Henry, Thursday, December 30, 2010 at 3:04pm
Jen's age = X yrs.
Jack's age = (2X 2) YRS.
(2X  2) + 3X = 68,
2X + 3X 2 = 68,
5X = 68 + 2 = 70,
X = 14 yrs. = Jen's age.
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