Find an equation of the line that satisfies the given conditions (0.5,0.2)

Point slope form of a line:
we need a point  (x₁,y₁) and the slope m

y-y₁=m(x-x₁)

We have a point (0.5 , 0.2) and the slope can take any value.

For example, if m=1
y-0.2=1(x-0.5)
y=x-0.5+0.2
y=x-0.3                      (y=mx+b ;  Slope-intercept form).

the equation of the line can be:
y=x-0.3

if m=2, then:
y-0.2=2(x-0.5)
y=2x-1+0.2
y=2x-0.8

other the equation of the line can be:
y=2x-0.8.