Question

Sum of two numbers is 25 and their difference is 9. What are the numbers?
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Answer 1

Step-by-step explanation:

two numbers be x and y

x+y=25

x-y=9

2x=34

x=17

y=8

Answer 2

Step-by-step explanation:

Let the unknown numbers be x and y.

x + y = 25

x - y = 9

x - y = 9

x = 9 + y

x + y = 25

9 + y + y = 25

9 + 2y = 25

2y = 16

y = 8

Now we know y is 8. Which means that we can substitute y for 8 in equation A and solve for x:

x + y = 25

x + 8 = 25

X = 17

Answer: 17 and 8 as proven here:

Sum: 17 + 8 = 25

Difference: 17 - 8 = 9