The sum of two numbers is 15, and their difference is 3, what are the two numbers?

Question

anonymous · Answer

14 and 5

anonymous · Answer

I edited the question. Please help!

anonymous · Answer

9 & 6

anonymous · Answer

Thanks. How did you get that please?

anonymous · Answer

Write it out as two equations:

a + b = 15
a - b = 3

Solve one of them for either a or b (it doesn't matter which equation or which variable):

a = 3 + b

Plug that into the other equation and solve:

(3 + b) + b = 15
3 + 2b = 15
2b = 12
b = 6

Now you can use either equation to solve for a:

a - 6 = 3
a = 9

So your answer is 6 and 9 (plug them into both equations to double check).

anonymous · Answer

oh ok cool! Thanks