Question

Tell whether the lines for each pair of equations are parallel, perpendicular, or neither. y = 5x y = -5x + 7 a. parallel b. neither c. perpendicular

Answer 1

For a line to be parallel to another, the slopes must be the same. For them to be perpendicular, the must be the negative reciprocal (i.e. -1/2 is perpendicular to a slope of 2). If neither of these two is true, then its neither. So, by what you've written, your two lines are neither parallel nor perpendicular.