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.
Answer This Question
Related Questions
 math  mary is x years old. it is her birthday today. her sister, sherry is 4 ...
 math  you are 6 years older than your sister she is 4 years older than your ...
 Algebra  Mario is 16 years older than his sister Mercedes. Together, their ages...
 Math  A girl is three years older than her brother. If their combined age is 35...
 MATH  Solve each questions by age equation problem: 1. Jonathan is 3 years ...
 math  A. A woman was 30 years old when her daughter was born.Her age is now 6 ...
 algebra  Thabos brother is 5 years younger than him.Their combined age is half ...
 maths  amelie is x years old her sister is four years older her brother is ...
 PreCalc  As of today, Jeff's age is three times Ming's age. Tina's age is four...
 math  your brother is 1/3 your age.your sister is 6 years older than your ...
More Related Questions