Question

f ( x ) = x + 2
       
      e 

f ( x ) = - 2 x +2

Answer 1

f(x)=x+2
y=x+2
0=x+2
x=2
----
f(x) =-2x +2
y=-2x+2
0=-2x+2
2x=2
x=$\frac{2}{2}$
x=1

Answer 2

f(x) = x + 2 
y = x + 2

x + 2 = 0 
x = - 2 

f(x) = -2x + 2

y= -2x + 2
-2x + 2 = 0
-2x = -2
x = $\frac{-2}{2}$
x = -1