K=- 1/2 b=-3/2 stands for a and b calculation.
Because AB//l 1
Let l 1 be y =-1/2x+m.
Replace m=7/2 with c.
L equation y=- 1/2x+7/2
2)
If the linear rotation formula is not used, let n point (m, n) be the symmetric point of AB and C.
There is AC=AN BC=BN
(m+3)^2+n^2=4^2+3^2
6^2+2^2=(3-m)^2+(n+3)^2
m=-3 n=-5
Let l2y = kx+b.
Replace B(3, -3), N(-3, -5)
k= 1 b=-4
y=x-4