GCSE Maths Practice: coordinates

Question 9 of 10

Identify the type of line with constant x-values.

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\( \begin{array}{l}\text{What type of line has constant x-values?}\end{array} \)

Choose one option:

Vertical = x constant, horizontal = y constant.

A vertical line runs up and down on the coordinate plane, keeping the x-coordinate constant while y varies. For example, the line x=3 is vertical. Understanding vertical lines is important for plotting points, finding intersections, and solving geometry problems. Practice identifying and drawing vertical lines on grids and comparing with horizontal or diagonal lines to reinforce the concept. Recognizing vertical lines helps with equations of lines and understanding slopes (slope is undefined).