the sum of two number is 29 and their difference is 5. Find the answer?

👨🏻‍🏫 學術台數學

[匿名]

2009-01-14 11:19 am

更新1:

show how you get the answer

更新2:

show how you get the answer and the check

回答 (8)

[匿名]

2009-01-14 11:27 am

✔ 最佳答案

let x and y be the number

eq.1 sum of two number is 29
x + y = 29

eq2 their difference is 5
x - y = 5

solving the two equations we have
x + y = 29
x - y = 5
------------------
2x = 34
x = 17 (answer)

from
x - y = 5
17 - 5 = y
y = 12 (answer)

so the numbers are
12 and 17 (answer)

👍 4 👎 3

[匿名]

2009-01-14 11:24 am

12+17=29

👍 2 👎 2

[匿名]

2009-01-14 11:22 am

12 and 17 its not hard

👍 1 👎 0

[匿名]

2009-01-14 11:23 am

12 and 17.

👍 1 👎 1

bskelkar

2009-01-14 11:23 am

They are 17 and 12.
Just solve x+y = 34 and x-y = 5.

👍 1 👎 1

[匿名]

2009-01-14 11:23 am

numbers are (29+5)/2 and (29--5)/2 OR 17 and 12.

👍 1 👎 1

An ESL Learner

2009-01-14 12:19 pm

x + y = 29 (solve by using elimination)
x - y = 5

...x + y = 29
+) x - y = 5 (addition)
-------------------------
2x = 34

2x = 34
x = 34/2
x = 17

x + y = 29
17 + y = 29
y = 29 - 17
y = 12

∴ x = 17 , y = 12

👍 0 👎 0

[匿名]

2009-01-14 11:37 am

suppose two num are x &y.
then x+y=29.......(1)
x-y=5..........(2)
add eqn1 fm eqn2
2x=34 ,x=17 ,
in eqn2 17-y=5,
y=12
x=17 reqd answer

👍 0 👎 0

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