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Which writing system was first used for Slavic languages?

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Map of Europe showing the geographic distribution of Slavic languages, color-coded by language group: East Slavic (Russian, Ukrainian, Belarusian), West Slavic (Polish, Kashubian, Czech, Slovak, Sorbian), and South Slavic (Bosnian-Croatian-Montenegrin-Serbian, Slovene, Bulgarian, Macedonian). Striped areas indicate regions where bilingualism is common. — Slavic languages Distribution of the Slavic languages in Europe.

The first writing system used for Slavic languages was the Glagolitic alphabet.

Invented around 860 CE by the missionary St. Cyril (Constantine), this script was designed to accurately reflect the sound system of the Slavic language, specifically the Macedonian dialect. It served as the primary script for Old Church Slavonic, the first Slavic literary language, for approximately 300 years.123

While Glagolitic was the original system, it was gradually replaced by the Cyrillic alphabet, which was developed in the 10th century by disciples of Cyril and Methodius. Although the two scripts are distinct in form, they shared similar sound values. Over time, Cyrillic became the dominant script for many Slavic languages, while others adopted the Latin alphabet.142