Can someone plz explain line & polyline to me?

Question

why is there line×1 & y1 =10 × 2 ? where is x1 & x2? What is stroke & line cap?

Answer 1

https://www.w3schools.com/graphics/svg_polyline.asp

https://www.w3schools.com/graphics/svg_line.asp

Answer 2

it's not too necessary u can skip that part