The lines are identical.
Work Step by Step
To find out if graphs of equations are identical lines, parallel lines or lines intersecting at a single point you need to compare the slopes first. The slope is the value multiplied by x when the equation is in this form: y=mx+b To this we need to transform the equations. $3x+y=0 <=> y=-3x$ $2y=-6x <=> y=-3x$ If lines are parallel or identical they hav the same slope, if they do not and are therefore intersecting at a single point the slope is different. If transforming the equations shows that the equations are exactly the same the lines are identical