See attachment grab a shovel and help unbury the dyeing.
Hello, jeilynn,
the slope m of a straight line between two points of this line is calculated by:1) slope (AB):Code:y1 - y2 m = ----------- x1 - x2
m_(AB) = (1 - (-1))/(-3 - 2) = 2/(-5) = -2/5
2) slope (BC):
m_(BC) = (-1 - 4)/(2 - 4) = (-5)/(-2) = 5/2
Because m_(Ab) * m_(BC) = -2/5 * 5/2 = -1 the lines (AB) is perpendicular to line (BC)