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?

Answer 1

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.

Answer 2

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

Answer 3

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.