Which of the following functions are linear y 3x2 5 2x 4y
     Which of the following functions are linear?  y = 3x^2 + 5  2x + 4y=16  y = 1/x +5  Select all that apply.  y= 1/x +5  2x +4y = 16  y=3x^2 +5 
  
  Solution
A linear function has the following form
y = f(x) = a + bx
A linear function has one independent variable and one dependent variable
a)
y = 1/x +5
It is not a linear function as it has degree of term x^-1
B 2x +4y = 16
y = -x/2 +4
It is a linear function
C. y = 3x^2 +5 has term x^2 so, it is not a linear function
Option B

