Sorry about yesterday, are you still able to help?
@DanJS

Choose the equivalent system of linear equations that will produce the same solution as the one given below.
6x + 2y = -6
3x - 4y = -18

12x + 4y = -12
15x = -30
8x + 4y = -4
14x = -10
6x - 8y = -36
-6y = -42
6x - y = -15
3y = 9

Question

Sorry about yesterday, are you still able to help? 
@DanJS

Choose the equivalent system of linear equations that will produce the same solution as the one given below. 
6x + 2y = -6
3x - 4y = -18

 	
	12x + 4y = -12
15x = -30
	8x + 4y = -4
14x = -10
	6x - 8y = -36
-6y = -42
	6x - y = -15
3y = 9

anonymous · Answer

Or anyone @kevindragonlord

anonymous · Answer

@hartnn

anonymous · Answer

the solution to the first one is $(-2,3)$ i suppose you could check which other system h as the same solution

anonymous · Answer

lets try the last one first $$6x - y = -15\ 3y = 9$$

anonymous · Answer

$$6\times -2-3=-12-3=-15\checkmark\
3\times 3=9\checkmark$$

anonymous · Answer

looks like a winner

anonymous · Answer

So you just add (-2,3) into the equation, do the math and see if it comes out correct?

anonymous · Answer

@satellite73

anonymous · Answer

yes, if by "add" you mean replace x by -2 and y by 3

anonymous · Answer

Where did you get (-2,3) though?

anonymous · Answer

from the original system

anonymous · Answer

solve $$6x + 2y = -6\3x - 4y = -18$$ by doubling the first one to get 
$$12x+4y=-12\
3x-4y=-18$$ add and get 
$$15x=-30\
x=-2$$

anonymous · Answer

Oh okay, thank you! so then 6x - y = -15
3y = 9 is the answer? @satellite73