Posted by Sarah on Wednesday, December 29, 2010 at 4:30pm.
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.
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
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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