For question 2, You also to sketch a x-y graph, then you can find intersect point , and the angle , then you have D( 3,-8 ) , which is under the intersect point, so the equation should be the base(When you sketch a x-y graph you will understand what i mean). Then for the properties of isosceles triangle , you should discover that two angle should be the same. And finally , you applied point-slope form to form the equation. In fact, this question is quite difficult for me, i spend about 30mins to think it.

The equation are: 4x – 3y – 36 = 0 -4x + 3y + 36 = 0

2x – y + 14 = 0

I am a Form 7 Student in Hong Kong.