Are these solutions to the following system of equations?

Question

anonymous · Answer

$$-14x+2y=-8$$
$$y=7x-4$$
|dw:1360810705034:dw|

anonymous · Answer

Could you post what you have so far in solving the equations?

anonymous · Answer

$$-14x+2y=-8$$ and 
$$y=7x-4$$ means 
$$-14x+2(7x-4)=-8$$

anonymous · Answer

how does that tell me if these numbers are solutions or not?

anonymous · Answer

solve for $x$ via 
$$-14x+2(7x-4)=-8$$
$$-14x+14x-8=-8$$ hmmm

anonymous · Answer

looks like you have 
$$-8=-8$$ which means both lines are the same
so all ordered pairs that fit will work

anonymous · Answer

try $(3,17)$ i think that works

anonymous · Answer

$$y=7x-4$$
$$17=7\times 3-4$$
$$17=21-4$$
$$17=17\checkmark$$

anonymous · Answer

all the others do not work, you can check them

anonymous · Answer

Thank you(:$$(3, 17)$$ does work, but there is also another one that works that I can't seem to find. I must be doing something wrong.

anonymous · Answer

$(0,-4)$ works, but you typed in $(0,4)$ which does not 
none of the others are even close

anonymous · Answer

Hmm.. thats strange.

anonymous · Answer

(-1, -11) works!

anonymous · Answer

$(-1,-11)$ also works

anonymous · Answer

I made a type up there, that's why I messed up.. :/

anonymous · Answer

glad you caught it