How to convert this equation to y=mx+b form:

y+2x=y-2

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.