Question

In solving equations how do you know weather to add or subtract. eg
6x+6y=24
-5x+6y=21

Answer 1

If the number you're trying to neutralize is positive, you subtract and if negative you add.

Answer 2

inverse of each operation...

Answer 3

I've been taught that both equations add so you do the inverse so for that equation you would subtract the top from the bottom

Answer 4

are solving solving both equation at the same time? or individually?

Answer 5

at the same time

Answer 6

then use elimination method

Answer 7

yes thats what im doing then substituting it

Answer 8

what about this equation:
6x+7y=-16
2x-4y=5

Answer 9

ok the idea is to cancel one variable, and solve the other variable

Answer 10

ok what variable u want to cancel first..

Answer 11

choose wisely

Answer 12

6x+7y=-16
2x-4y=5
if you multiply the second equation by -3, ull get -6x+12y=15

Answer 13

OMG i was typing and wrote and it just started to reload the page

Answer 14

ok so ... basically i know how to solve them but ....

Answer 15

.... i want to know that if you have this equation: 6x+7y=-16
2x-4y=5
then to eliminate/solve how do you know if you add or subtract or can you do any ?

Answer 16

ur always adding not substracting

Answer 17

sure?

Answer 18

yeh

Answer 19

ook thanks for helping jizakallah

Answer 20

:)

Answer 21

:D

Answer 22

I think this guy explain it better than me.. here you go
https://www.youtube.com/watch?v=EooANDoThys