Asked by Mary
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.
Answers
Answered by
Damon
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
x + 7 + x+ 4 +7 = 2x + 18 = 24 after seven years
2x = 6
x = 3
x+4 = 7
so James is 3 now
Answered by
Reiny
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.
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.
There are no AI answers yet. The ability to request AI answers is coming soon!
Submit Your Answer
We prioritize human answers over AI answers.
If you are human, and you can answer this question, please submit your answer.