QUESTION IMAGE
Question
find the slope of each line and write the equation of each graph.
9.
10.
Step1: 选点求图9斜率
取直线上两点$(-5,-1)$和$(0,-2)$,根据斜率公式$m=\frac{y_2-y_1}{x_2-x_1}$,得:
$m=\frac{-2-(-1)}{0-(-5)}=\frac{-1}{5}=-\frac{1}{5}$
Step2: 求图9直线方程
直线截距$b=-2$,代入斜截式$y=mx+b$,得:
$y=-\frac{1}{5}x-2$
Step3: 选点求图10斜率
取直线上两点$(-5,0)$和$(0,2)$,根据斜率公式$m=\frac{y_2-y_1}{x_2-x_1}$,得:
$m=\frac{2-0}{0-(-5)}=\frac{2}{5}$
Step4: 求图10直线方程
直线截距$b=2$,代入斜截式$y=mx+b$,得:
$y=\frac{2}{5}x+2$
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- 图9:斜率为$-\frac{1}{5}$,直线方程为$y=-\frac{1}{5}x-2$
- 图10:斜率为$\frac{2}{5}$,直线方程为$y=\frac{2}{5}x+2$