Question

Which function is NOT linear?


y
=
1
2
x
−
1


3
x
−
4
y
=
−
16


y
=
(
2
x
−
1
)
2


y
+
6
=
3
(
x
+
2
)

Answer 1

y = (2x − 1)^2

This is not linear because it expands to 4x^2 − 4x + 1, which contains an x^2 term (a quadratic), not the form y = mx + b.