Asked by Sarah
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?
Answers
Answered by
TutorCat
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.
[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.
Answered by
elizabeth
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
A.)O -1 B.)6 -3 1/2
1.5 3 AND
7 -2
Answered by
Henry
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.
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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