I'm retarted, so I need help with this: how did the author go from -12x+9y=7 to 9x+-12y=6?
You're probably missing some information in the book. What subject is this?
>>8491246
he didn't
those are different equations with different solutions
>>8491246
-12x+9y=7 to 9x+-12y=6
divide everything by 9
y=7/9+4/3x
times by -12
9x+-12y=6
there
bad times
>>8491265
>12(7/9)=6
>>8491246
Are you sure that isn't just a linear system?
>>8491265
this guys the bomb