Question 423506
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Hi
Are the lines wtih the given slopes parallel? No
m= -2/3, m = 2/3
For example:  y = -2/3x (Green) and  y = 2/3x (Blue)
Note the effect of a slope of a Line being positive: {{{m =(y[2] - y[1])/(x[2] - x[1])}}}
y and x 'vary in the same direction'..getting larger or smaller together 
and as in the case of the (blue) line... slant to the right
{{{drawing(300,300,   -6, 6, -6, 6,  grid(1),
graph( 300, 300, -6, 6, -6, 6,0,(-2/3)x,(2/3)x)))}}}