Need to know how to graph this example y= -2x + 25. I know that y=mx+b. Just confused on how to get what they call plug in. Can someone explain please. Example how do I know x= 0 and X= 1

Need to know how to graph this example y 2x 25 I know that ymxb Just confused on how to get what they call plug in Can someone explain please Example how do I k class=