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Algebra
Question

Which of the following pairs of lines are not parallel?

$$y=-2, y=4$$

$$x+y=3, x-y=3$$

$$y=\frac{1}{2}x+5,y=\frac{1}{2}x-4$$

$$2x+y=-5, 6x+3y=9$$

$$x+y=3, x-y=3$$