y=kx+b
x=3 y=2
3k+b=2
b=2-3k
y=kx+2-3k
x=0,y=2-3k
y=0,x=(3k-2)/k
2-3k+(3k-2)/k=12
2k-3k^2+3k-2=12k
3k^2+7k+2=0
k=-1/3 or k=-2
y=-x/3+3 or y=-2x+8