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QUESTION IMAGE

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: 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:
$y=\frac{2}{5}x+2$

Answer:

  1. 图9:斜率为$-\frac{1}{5}$,直线方程为$y=-\frac{1}{5}x-2$
  2. 图10:斜率为$\frac{2}{5}$,直线方程为$y=\frac{2}{5}x+2$