slope method
Implementation
double? slope() {
final x1 = a.x;
final y1 = a.y;
final x2 = b.x;
final y2 = b.y;
if (x1 == x2) return null;
return (y1 - y2) / (x1 - x2);
}
double? slope() {
final x1 = a.x;
final y1 = a.y;
final x2 = b.x;
final y2 = b.y;
if (x1 == x2) return null;
return (y1 - y2) / (x1 - x2);
}