In general, there are various alternative teacher certification pathways that allow individuals to teach high school mathematics with a bachelor's degree in a non-mathematics field, including English. These pathways typically require candidates to complete a specific number of college-level mathematics courses, often including subjects like algebra, geometry, and calculus, as well as pedagogy and teaching methodology courses. Some programs also require candidates to pass a subject matter knowledge test in mathematics.
While having an English degree alone does not qualify you to teach math, with additional coursework and certification, you can potentially pursue this career. It is important to thoroughly research the requirements in your location and choose an accredited teacher certification program that aligns with your goals.