3x - y = -6
There are several ways to graph this equation.
But, considering that it is a linear equation, we simply need two points.
We can find the each point by letting x and y = zero separately.
Let x = 0 and solve for y.
3x - y = -6
3(0) - y = - 6
-y = -6
y = -6/-1
y = 6
Our first point is (0,6).
Now let y = 0 and solve for x.
3x - y = -6
3x -(0) = -6
3x = -6
x = -6/3
x = -2
Our second point is (-2, 0).
Now, plot these two points on the xy-plane and then connect them with a straight line.