we have the equation
20x+2y=1
Remember that the equation of the line in slope-intercept form is
y=mx+b
so
Isolate the variable y in the given equation
step 1
subtract 20x on both sides
20x+2y-20x=-20x+1
simplify
2y=-20x+1
step 2
Divide by 2 both sides
2y/2=(-20x+1)/2
simplify
y=-10x+1/2