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 4x + 4y = 20
If I'm not mistakened, this is in it's standard form. 
Slope intercept form → y = mx + b

Let's transform this into that form. 
4x + 4y = 20
4y = -4x = 20
y = -x + 5 

The slope intercept form would be ⇒ y = -1x + 5 

Answer:

y=-x+5

Step-by-step explanation:

The equation of a line in the form:

  y=mx+c is called the slope intercept form of a line.

4x+4y=20

⇒  4y=-4x+20

on dividing by 4 on both sides,we get

y=[tex]\dfrac{-4}{4}\times x+\dfrac{20}{4}[/tex]

⇒ y=-x+5

Hence, the slope intercept form of 4x+4y=20 is:

    y= -x+5