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The line equation in slope-intercept form is , where m is the slope

and b is the y-intercept.

Find the slope of the equations.

Slope of the first equation is -5

Slope of the second equation is 5

If two lines are parallel, their slopes must be equal. (Or)

If two lines are said to be perpendicular, the product of their slopes is equal to -1.

Here in this case, the two slopes are neither equal nor their product is equal to -1.