Solve the system x - y = 3 and 3x - 8y = 9. What is the value of y?
3
0
6
-2
@marissalovescats

Question

Solve the system x - y = 3 and 3x - 8y = 9. What is the value of y?
   3 
   0 
   6 
   -2 
@marissalovescats

anonymous · Answer

@satellite73 would I work this one the same way as the last one?

anonymous · Answer

$$x-y=3\3x-8y=9$$ if you want you can multiply the first equation by $-3$ and get 
$$-3x+3y=-9\
3x-8y=9$$

texaschic101 · Answer

you can use substitution or elimination

marissalovescats · Answer

Use elimination to get rid of the x to solve for y so times the whole 1st equation by -3 and tell me what you get

anonymous · Answer

you can't just add in this case because nothing will drop out of you do 
but if you multiply the first equation all the way across by $-3$ then the $-3x$ and the $3x$ will add up to zero

anonymous · Answer

9? @marissalovescats

texaschic101 · Answer

or sub 3 - y in for x in the 2nd equation

anonymous · Answer

$$-3x+3y=-9\
3x-8y=9$$ now if you add them the $x$'s go away and you get 
$$-5y=0$$which tells you $y=0$

marissalovescats · Answer

Yup I got 0 ^^

anonymous · Answer

o some how I ended up with 3, but I see what I did I wrote it messy and used a different number thanks! both of you @satellite73 @marissalovescats