Answer:
6
Step-by-step explanation:
Hey there) The formula of your line is:
[tex]-2=2k+b\\2=-6k+b\\=>4=-8k\\k=-0.5\\=> b=-2+1=-1\\=>y=-\dfrac{1}{2}x-1\\[/tex]
If point has y=-4, then:
[tex]-4=-\dfrac{1}{2}a-1\\4=\dfrac{1}{2}a+1\\a=6[/tex]
Hope this helps) Have a nice day/night :)
