Answer:
See below.
Step-by-step explanation:
slope of the dotted line: m = (-3 - 5)/(0 - 8) = 1
slope of second line (perpendicular to dotted line): -1
The bold line (second side) has slope -1 and passes through point (-4, 9).
y = mx + b
9 = -1(-4) + b
9 = 4 + b
b = 5
Equation of bold line: y = -x + 5
The third side of the rectangle is parallel to the dotted line and contains point (-4, 9). slope = 1
y = mx + b
9 = 1(-4) + b
9 = -4 + b
b = 13
Equation of third side: y = x + 13
The third side lies on a line that is parallel to the dotted line, so its slope is the same as the slope of the dotted line. The third side contains point (-4, 9). We use the equation y = mx + b and substitute -4 and 9 for x and y, respectively. Then we solve for b.
