Answer:
The slope of the line is 3
Explanation:
we know that
The formula of slope is "rise over run", where the "rise" (means change in y, up or down) and the "run" (means change in x, left or right)
![rise=y2-y1](https://img.qammunity.org/2021/formulas/mathematics/middle-school/i3807jgxt826gq6djeyeii9jinobjjerc5.png)
![run=x2-x1](https://img.qammunity.org/2021/formulas/mathematics/middle-school/1b94yqeynomndk3ukcbrhvh8hyyqgy9m8n.png)
therefore
The formula to calculate the slope between two points is equal to
![m=(rise)/(run)=(y2-y1)/(x2-x1)](https://img.qammunity.org/2021/formulas/mathematics/middle-school/7wn5w0b6p6gvagcxpfgel64apf1zeqbkl3.png)
take two points from the graph
(0,-1) and (1,2)
![rise=2+1=3](https://img.qammunity.org/2021/formulas/mathematics/middle-school/7f5hsh3lqo1nig0wqf5xjxxs0vrpnyjnmb.png)
![run=1-0=1](https://img.qammunity.org/2021/formulas/mathematics/middle-school/8mxn6ml5w2yt8cbgkn3kwi8e6z96rkfqmc.png)
![m=(3)/(1)=3](https://img.qammunity.org/2021/formulas/mathematics/middle-school/uiibb5dd0c8yqbtz6xymy595r2knkt6xw2.png)