Solve by graphing

Question

Solve by graphing

vshiroky · Answer

attachment

misty1212 · Answer

HI!!

misty1212 · Answer

$$x-y=-2\
x+y=4$$ if you add them you get 
$$2x=2$$ and so $x=1$

vshiroky · Answer

That doesn't make sense to me still. I have to have 2 ordered pairs.

misty1212 · Answer

yes, i know you need two numbers $(x,y)$ but if $x=1$ and $x+y=4$ then you know what $y$ is right?
you have $1+y=4$ so that means  $y=3$

vshiroky · Answer

ok...

misty1212 · Answer

the ordered pair is $(1,3)$ and you can check it is right, because $1-3=-2$ and $1+3=4$ as required

misty1212 · Answer

but you don't seem convinced huh?

vshiroky · Answer

No I get that now, but when I graph it how do I know where to put my 2nd point?

misty1212 · Answer

graphing is really a bad way to do this 
do you actually have to graph both lines?

vshiroky · Answer

I do

misty1212 · Answer

ok that sucks
no matter you are going to have to graph two different lines, not one line
they will meet at $(1,3)$ 
you can plot some  points for $x-y=-2$ for example you can plot $(0,2)$ and $(-2,0)$ and connect the dots

misty1212 · Answer

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misty1212 · Answer

then you have to graph the line $x+y=4$ again by plotting two points, say $(0,4)$and $(4,0)$

vshiroky · Answer

Thank you. I do not like these lol I still have like 8 more!