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II. Tự luận Câu 1: Cho hàm số \( y=3 x \) a) Điểm \( \mathrm{M}(-2 ;-6) \) có thuộc đồ thị hàm sao? b) Vẽ đồ thị hàm số trên

Ask by Fleming Bradley. in Vietnam
Mar 14,2025

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Điểm \( M(-2; -6) \) thuộc đồ thị hàm số \( y = 3x \). Đồ thị hàm số \( y = 3x \) là một đường thẳng đi qua gốc tọa độ \( (0, 0) \) và có độ dốc 3.

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Điểm \( M(-2; -6) \) có thuộc đồ thị hàm số \( y = 3x \) hay không, ta chỉ cần thay giá trị \( x \) vào hàm. Với \( x = -2 \), ta có \( y = 3(-2) = -6 \). Vì \( y \) ở điểm \( M \) cũng bằng -6, nên điểm \( M \) thuộc đồ thị hàm số. Để vẽ đồ thị hàm số \( y = 3x \), bạn chỉ cần vẽ một đường thẳng đi qua gốc tọa độ (0,0) với độ dốc là 3. Tất cả các điểm (x, 3x) sẽ nằm trên đường thẳng này, ví dụ như điểm (1, 3) hay (-1, -3) cũng sẽ nằm trên đồ thị. Hãy sử dụng giấy kẻ ô để vẽ cho đẹp nhé!

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