Tī sò͘-ha̍k siōng, chi̍t tiâu ti̍t-soàⁿ ê siâ-lu̍t (斜率; pe̍h: chhiâ-lu̍t) tī ta̍k-ê só͘-chāi lóng sio-kāng, i sī ti̍t-soàⁿ ê thán-khi thêng-tō͘ ê liông-tō͘.
Thàu-kòe tāi-sò͘ kap kí-hô, ē-ēng kè-sǹg chhut ti̍t-soàⁿ ê siâ-lu̍t. Khiok-soàⁿ téng bó͘ chi̍t tiám ê chhiat-soàⁿ siâ-lu̍t hoán-èng chhut chit tiâu khiok-soàⁿ ê piàn-sò͘ tī chit tiám ê piàn-hòa ê kín-bān thêng-tō͘. Lī-iōng bî-chek-hun ē-ēng kè-sǹg chhut khiok-soàⁿ téng jīm-hô chi̍t tiám ê chhiat-soàⁿ siâ-lu̍t.
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