Lines that intersect at right angles are called perpendicular lines. All vertical lines are perpendicular to all horizontal lines. Lines are perpendicular if and only if the product of their slopes, m1 and m2, is -1.
m1⋅m2=-1
This graph shows one pair of perpendicular lines.
Are the lines shown in the graph perpendicular? Justify your answer.
Write the equation of the line that's perpendicular to y=32x−1 and passes through the point (0,-1).