How to write a slope intercept form?

Your answer is good Max but answers only do not help people learn.

Your better of to give a half answer with no final answer than a final answer with no working.

In fact I think half answers are often really good. :)

Slope is -2/5      I don't know the y intercept but the line passes through ( -2,2)

$y=mx+b\\ y=\frac{-2}{5}x+b\\ Sub\;\;in\;\; x=-2 \;\;and\;\; y=2\\ 2=\frac{-2}{5}\times -2+b\\ 2=\frac{4}{5}+b\\ 10=4+5b\\ 6=5b\\ b=\frac{6}{5}\\ so\\ y=\frac{-2x}{5}+\frac{6}{5}\\$

slope-intercept form means ' in the form of y=ax+b ' and the answer for this is $y=-\frac{2}{5}x+\frac{6}{5}$