Answer:
(a) x = 6
(b) x = -5.5
Step-by-step explanation:
To determine the axis of symmetry, simply find the midpoint of the x-values of each pair of ordered pairs.
(a) 3, 2) (9, 2)
[tex]\sf midpoint \ of \ x \ values=\dfrac{9-3}{2}+3=6[/tex]
⇒ axis of symmetry: x = 6
(b) (-18, 3) (7, 3)
[tex]\sf midpoint \ of \ x \ values=\dfrac{7-(-18)}{2}+(-18)=-5.5[/tex]
⇒ axis of symmetry: x = -5.5
