Photomath is a good one. So is KhanAcademy, but I don't know if they have an app version of the website.
Answer:
-8x=19-3
-8x=16
x= 16/-8
x=-2
Step-by-step explanation:
Use the line. line it up line up the triangle
Gradient = change in y /change in x so -6-2 =-8 / -16-4 = -20 so -8/-20 = 0.4 so gradient = 0.4
