let's call G the intersection point of EF & BC.
according to the thales' theorem:

and EF= EG+GF=EG+3




length of the altitude of △AED=EF
EF=EG+GF=1.5+3=4.5
The y- intercept has to be a point in the line where x is 0. Which means that in this case it would be -4.
To find the slope, use the formula: rise over run —> y2 - y1/x2 - x1
Choose any two coordinates and plug them in. Then simplify. Let me know if you have any questions by commenting:)
Hope I helped:)

; where a = 1, b = -4 and c = 8
Answer:
5.625
Step-by-step explanation:
45 ÷ 8 = 5.625