What is the effect if two parallel lines are rotated 90° clockwise?
change direction but remain parallel
change direction but are now perpendicular
no longer parallel because one line changed direction
no longer parallel because two lines changed direction

The image of abc is a'b'c. what transformations would result in this image? abc is reflected over the line x = 1, then is rotated -90° around the origin. abc is reflected over the line y = x - 1, then t: (x, y) → (x - 1, y - 1). abc is rotated 90° around the origin, then is reflected over the y-axis. abc is rotated -90° around the origin, then is reflected over the line y = -1.