Question

3x - 4y = 7
3x + 2y = -5

When the second equation is subtracted from the first, the resulting equation is _____.

-6y = -12
-6y = 12
-2y = -12
2y = 12

I tried but I can't get it.

Answer 1

Well combine the like terms 3x-3x -4y - +2y and 7 - -5

Answer 2

I can't get -4y - +2y

Answer 3

You can though... It's the same thing as -4y-2y ... In fact -4y-2y is equivalent to -4y---2y

Answer 4

-6y = 12 is that correct??

Answer 5

What is -(-2)= ?

Answer 6

+2 I think

Answer 7

Yes, so you got it. Each negative yields the opposite of the number with one less.

Answer 8

Thank you very much! :D

Answer 9

You're very welcome!