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# Algebra 1 - Lines Parallel or Perpendicular to Axes

Updated: Aug 17

This post explains and give practice opportunities related to TEKS A.2G:

write an equation of a line that is parallel or perpendicular to the X or Y axis and determine whether the slope of the line is zero or undefined;

## Instruction

Lines that are parallel to a given axis can be described by their opposite coordinate. For example, a line parallel to the x-axis can be described by its y-coordinate (e.g., y = 4). Vertical lines (parallel to y-axis) have an undefined slope and horizontal lines (parallel to x-axis) have a slope of 0.

## STAAR Practice

Between 2016 and 2022 (including redesign practice), this supporting standard has been tested 6 times on the STAAR test. Videos explaining the problems can be found below. If you'd rather take a quiz over these questions, click here. The videos below are linked to the questions in the quiz as answer explanations after the quiz is submitted.

To view all the posts in this Algebra 1 TEKS review series, click here.