You're rather close with your graph...however, the line you drew has slope $\displaystyle m=\frac{1}{3}$.
To get the correct graph, start with the point (0,-1) [the y intercept]. Now since the slope of the line is $\displaystyle m=\dfrac{\text{rise}}{\text{run}}=\dfrac{3}{1}$, go up 3 units from the y intercept, and then move 1 unit to the right to get the next point (1,2). Then connect the two points and that's your line.
Does this make sense?
Do you mean 2x+y=7? If so, you're close...your x intercept isn't correct, but it has the right orientation.
So...to get the correct x intercept, what is the value of x in the equation if y=0?
Also, in the future, please make new threads for new questions -- it makes it easier for the other users to follow what's going on.