Which pair of words describes this system of equations? 3y=9x+6 2y−6x=4?

We can observe that both the equation represent equation y = mx + c

Rewrite the equations in the form of y = mx + c

3y = 9x + 6
=> y = 3x + 2

2y = 6x + 4
y = 3x + 2

m = slope.

Both the equations have m = 3, since only parallel lines have same slope so the answer is Parallel lines.

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