# Algebra

posted by .

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 -

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 -

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 -

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.

## Similar Questions

1. ### unknown

if i am 3 times as old as my sister and last year i was 4 times as old as her how old am i now and how old is she well how old is your sister You are 9 and she is 3 (3x3=9) Last year you were 8 and she was 2 (2x4=8) your sister is …
2. ### Math

This Christmas,your brother Jack will be 2 years from being twice as old as your sister Jen.The sum of Jack's age and three times Jen's age is 66.How old is Jen?

This Christmas,your brother Jack will be 2 years from being twice as old as your sister Jen.The sum of Jack's age and three times Jen's age is 66.How old is Jen?
4. ### math

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 66. how old is jem?
5. ### math

Michel is twice as old as his sister sylvia. In four years three times Micheal's age is equvialent to five times of sylvia's age. How old is Micheal now
6. ### math

A. A woman was 30 years old when her daughter was born.Her age is now 6 years more than three times her daughter's age. How old will the daughter be in 5 years?
7. ### math

A. John is now 10 years older than Marcus. Three times John's age 5 years from now will be the same as five times Marcus's age 5 years ago. How old is John now?
8. ### Algebra

Mary is y years old. Write an algebraic expression in terms of y for the age of A) her brother, who is 4 years older. B) her mother, who is 3 times as old. C) her sister, who is 2 years younger.
9. ### Math - age problem

One year ago Liz was 3 times as old as her brother Jack. In two years she'll only be twice as old as Jack. How old are Liz and Jack now?
10. ### maths

amelie is x years old her sister is four years older her brother is three times her age the sum of their age is 44 years

More Similar Questions