x+y=-1......[1]
3x-y=-7.....[2]
Take the first equation,substitute x=0,-1,1,2,-2 and so on, and calculate y
you will have all these values of x and y as pairs
x=0,y=-1
x=-1,y=0
x=1,y=-2
and so on
plot these on the graph as (x,y)=(0,-1),(-1,0),(1,-2) etc
Then draw a straight line through the points,connecting them
Repeat for the second equation
The lines will meet at a particular point.From the graph paper,look up the co-ordinates of the point,and there you have your solution. It should work out to (x,y)=(-2,1)
Hope this helps,
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