whats a linear function?

It's a function that is a straight line. :)

http://www.google.com/#q=+linear+function

thank u

You're welcome

A linear function is a mathematical function that can be represented by a straight line when graphed on a coordinate plane. It is a type of polynomial function where the highest power of the variable is 1. The general form of a linear function is given by:

f(x) = mx + b

where 'm' represents the slope of the line and 'b' represents the y-intercept, which is the point where the line crosses the y-axis.

To determine if a function is linear, you can consider the power of the variable. If the highest power is 1 and there are no other variables or exponents involved, it is a linear function. Additionally, if you are given an equation, you can check whether it satisfies the criteria of a linear function by checking if it can be written in the form mentioned above.