The answer is y=-4x+21
Well, you can do this by first putting the numbers into point-slope form. That will be y-21=-4(x-0)
Then, you can simplify by doing the distributive property.
Lastly, add 21 on both sides to get the slope-intercept form.
y-21=-4x+0
+21 +21
y=-4x+21
Hope this helps!✨❤️