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Len [333]
3 years ago
14

What two two digit numbers that when added together equal 30 and when subtracted equals 4 or -4? Please respond quickly and with

work and I will mark best answer as the brainliest answer!
Mathematics
1 answer:
Kazeer [188]3 years ago
7 0

Answer:

The two digit numbers are 13 and 17.

Step-by-step explanation:

Firstly, you have to form a simultaneous equation. The information is when 2 number are added equals to 30 and when substracted is equals to 4 or -4. Let variable to represents the number :

Let x be 1st number,

Let y be 2nd number,

x + y = 30 -  -  -  - (1)

x - y = 4 -  -  -  - (2)

Then you have to solve these simultaneous equation :

(1) - (2)

x - x + y - ( - y) = 30 - 4

y + y = 26

2y = 26

y = 13

Substitute y = 13 into (2),

x - 13 = 4

x - 13 + 13 = 4 + 13

x = 17

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