sum of 2 numbers if 15, their difference is 7. what are the numbers
Answers
Answered by
0
Answer:
x + y = 15
- x - y = 7
2y = 8
2y/2 = 8/2
y = 4
x + 4 = 15
x + 4 - 4 = 15 - 4
x = 11
check
11 + 4 = 15
15 = 15
11 - 4 = 7
7 = 7
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Answered by
5
Let the numbers be x and y
A/Q
• sum = 15
=> x + y = 15 ----- ( i)
• Difference = 7
=> x - y = 7 ------(ii)
Add both equation , we get :
=> 2x = 22
=> x = 22/2 = 11
put x = 11 in equation (i)
=> 11 + y = 15
=> y = 15-11= 4
Hence , the numbers are 11 and 4.
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