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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