The triangles are similar because of one triangle is 2x bigger than the other there seems to be a dilation. And since on triangle is 2x bigger the dilation between both triangles would be 2. I hope this helped :)
Hello Isaiah! (Cool name)
10x - 7y = -8
We need to use the slope - intercept form y = mx + b to find the slope m.
Thus, the slope for this is m= 10/7
I hope this helps!