Which expression correctly describes Quadrant I in terms of signs of x and y?

Which expression correctly describes Quadrant I in terms of signs of x and y?

• A. X<0, Y<0
• B. X>0, Y<0
• C. X>0, Y>0
• D. X<0, Y>0

Answer: (C)

Quadrant I is the region where both coordinates are positive. That means x must be greater than zero and y must be greater than zero. Visually, it’s the area to the right of the y-axis and above the x-axis. The other regions have different sign patterns: left of the y-axis and above the x-axis has x negative and y positive; left of both axes has x negative and y negative; right of the axis and below the x-axis has x positive and y negative. So the expression describing Quadrant I is x > 0 and y > 0.

Quadrant I is the region where both coordinates are positive. That means x must be greater than zero and y must be greater than zero. Visually, it’s the area to the right of the y-axis and above the x-axis. The other regions have different sign patterns: left of the y-axis and above the x-axis has x negative and y positive; left of both axes has x negative and y negative; right of the axis and below the x-axis has x positive and y negative. So the expression describing Quadrant I is x > 0 and y > 0.