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find the slope of each line and write the equation of each graph. 9. 10.

Question

find the slope of each line and write the equation of each graph.
9.
10.

Explanation:

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$y=mx+b$
$y=\frac{1}{6}x+1$

Answer:

  1. 直线9:斜率为$-\frac{1}{3}$,方程为$y=-\frac{1}{3}x-3$
  2. 直线10:斜率为$\frac{1}{6}$,方程为$y=\frac{1}{6}x+1$