Posted by **Mary** on Saturday, November 3, 2012 at 10:49pm.

Jane is x years old today. Her brother Kenny is 4 years older. After seven years their total combined age will be 24 years. Write a linear equation for their total combined age after seven years. Fine James age today.

- Math -
**Damon**, Saturday, November 3, 2012 at 10:57pm
x and x+4 forever

x + 7 + x+ 4 +7 = 2x + 18 = 24 after seven years

2x = 6

x = 3

x+4 = 7

so James is 3 now

- Math -
**Reiny**, Saturday, November 3, 2012 at 11:05pm
Now:

Jane --- x

Kenny --- x+4

after 7 years:

Jane --- x+7

Kenny -- x+11

at that time:

x+7 + x+11 = 24

2x = 6

x=3

Jane is now 3, (where does James come in ? )

...... If you have to do it using 2 variables ....

jane now --- x

Kenny now -- y

y - x = 4 (#1)

x+7 + y+7 = 24

x+y = 10 (#2)

add #1 and #2

2y = 14

y = 7

x = 3

Same answer, but the first method looked easier.

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