Question

the sum of 2 numbers is 9 and their difference is 6. What are the numbers?

Answer 1

Let x and y be the two numbers.
Then,

x + y = 9 and
x - y = 6

Answer 2

x + y = 9
x - y = 6
---------

Add the above two equations.
You can then solve for x and then y.

Check to be sure the numbers do add to 9 and have a difference of 6.

Post your answers here and someone will check, okay?

@saber_doll

Answer 3

@saber_doll if you follow @Directrix 's steps, it'll bring you to the right solution :) Do you know what the first step is?

Answer 4

no.

Answer 5

what is is?

Answer 6

ok, you're going to solve for one equation in terms of the other. The two equations are:
1) x + y = 9
2) x - y = 6
so what you're going to do take the 1, ok? now, say that y=9-x (all i did was move x from one side to the other). Now you will substitute that value of y into the equation 2, so you will get x - (9-x) = 6. can you solve that?

Answer 7

i'll try it now. thanks :)

Answer 8

yep, let me know if you get it :)

Answer 9

x+y+x-y=9+6
2x=15
x=7.5

7.5+y=9
y=9-7.5
y=1.5

I got it! is it right? :D @Khushal_Shah

Answer 10

correct! nice job :) It's a little different than how I was saying, but it works out perfect in this situation :) Well done!

Answer 11

Haha. Thanks alot you guys! :)))

Answer 12

of course, anytime mate