Answer:
i think it is A, C, OR B, **For the first equation**
Step-by-step explanation:
SRRY IF WRONG!
1/2x+b=y
1/2*4+b=3
2+b=3
b=1
1/2x+1=y
I think one is 8.7 + 0 = 8.7
(x,y) becomes (-y,x) so (3,2) would become (-2,3)