Which of the following equations represent linear functions? y=x2−3x

4x+y=5

y=|2x+1|

y=−5

4x+y=5 or b is the correct ) Linear functions are those whose graph is a straight line. A linear function has the following form. y = f(x) = a + bx. A linear function has one independent variable and one dependent variable. The independent variable is x and the dependent variable is y.