QUESTION IMAGE
Question
find the slope of each line and write the equation of each graph.
9.
10.
Step1: 取直线9的两点
选取点$(-6, -1)$和$(0, -3)$
Step2: 计算直线9的斜率
斜率公式:$m=\frac{y_2-y_1}{x_2-x_1}$
$m=\frac{-3-(-1)}{0-(-6)}=\frac{-2}{6}=-\frac{1}{3}$
Step3: 求直线9的方程
直线在y轴截距$b=-3$,代入斜截式$y=mx+b$
$y=-\frac{1}{3}x-3$
Step4: 取直线10的两点
选取点$(-6, 0)$和$(0, 1)$
Step5: 计算直线10的斜率
$m=\frac{1-0}{0-(-6)}=\frac{1}{6}$
Step6: 求直线10的方程
直线在y轴截距$b=1$,代入斜截式$y=mx+b$
$y=\frac{1}{6}x+1$
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- 直线9:斜率为$-\frac{1}{3}$,方程为$y=-\frac{1}{3}x-3$
- 直线10:斜率为$\frac{1}{6}$,方程为$y=\frac{1}{6}x+1$