A. give the coordinate of F and H in terms of a
Given
E (0,0) and G (8,8)
H (8, [8-a])
F ([8 - a], 8)
B. using the coordinate of E, F, G, and H, find the slope of EG and FH. show your work
Line EG
E (0,0) and G (8,8)
slope = 8/8 = 1
Line FH
H (8, [8-a]) and F ([8 - a], 8)
slope = (8 - a - 8) / (8 - [8-a])
slope = (8 - a - 8) / (8 - 8 + a)
slope = -a/a
slope = -1
C. use part B to prove that EG _|_ FH
Line EG has slope = 1 and line FH has slope = -1
Slopes are negative and reciprocal so the line EG is perpendicular to line FH.