Question

Question
Which of the following gives an example of a function that is not linear?(1 point)
Responses

9x+3y−18=0
9 x plus 3 y minus 18 equals 0

y=x2−3x+2.25
y equals x squared minus 3 x plus 2.25

2x+3y=16
2 x plus 3 y equals 16

y=16x+23
y equals Start Fraction 1 over 6 End Fraction x plus Start Fraction 2 over 3 End Fraction

Answer 1

y = x^2 − 3x + 2.25

This is not linear because it contains an x^2 term (a quadratic), whereas a linear function has variables only to the first power.