From the given information:
Circle 1:
Center (5,8)
radius= 8 cm
Circle 2:
Center (1,-2)
radius= 4 cm
The above circle are similar because you can translate Circle 1 using the transformation rule (-4,-10) translation and dilate it using a scale factor of 4/8=1/2
Your range on a graph always the values that y could possibly be. These often include infinity since lines trend in one direction or the other.
Y = mx + b is in the form of slope-intercept.
From the equation given, y + 2x = y - 2, we can convert it in the format of the slope intercept form and it depends we can came up to that form.
y + 2x = y -2
y - y = -2x - 2
0 = 2x + 2
x = -1
Unfortunately, the form y = mx + b is impossible to achieve.