Mathematical equation
Definition
A symbolic statement showing that two expressions are equal, often used to describe relationships, patterns, or rules involving numbers or variables.
Example Image
Writing Alternative Text
Only use alt text if the equation is an image. If possible, use a real equation editor (e.g., MathML, Word equation editor). Images—even with alt text—are a fallback, not the best option. Read the equation in logical order from left to right. Use clear relational words, such as "equals," "is equivalent to," or "is defined as", rather than describing visual layout. Explicitly state all mathematical elements. Name variables and their meanings when relevant (e.g., "x," "y," "n"). Specify subscripts, superscripts, and exponents clearly (e.g. "x squared," "a sub n," "2 to the power of n"). Include operators as words (e.g. "plus," "minus," "times," "divided by," or "equals"). For fractions, use "over" or "divided by" (e.g., "x over y" or "x divided by y"). Focus on the mathematical relationship, not the formatting. Describe what the equation represents (e.g. a formula, identity, definition, or solution), rather than font style, size, or alignment. For complex nested expressions, use grouping language, such as "the quantity" or "the expression", to clarify structure (e.g., "the quantity x plus y, all squared").
Example Alt Text
"This image depicts the quadratic equation: x equals negative b plus or minus the square root of b squared minus four a c, all divided by two a."