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y=x2
Not at all.Y = x2 is a continuous function.
It's the gradient, or the steepness, of a linear function. It is represented by 'm' in the linear formula y=mx+b. To find the slope of a line, pick to points. The formula is (y2-y1)/(x2-x1). See the related link "Picture of a Linear Function for a picture of a linear function.
The word linear means in a straight line. If the graph is a line, it is linear. Also, linear equations are of the first order; they contain a variable but not a square (or higher power) of a variable. If the equation contains x2 it is not linear.
In general, it is linear if it is of the form a1x1 + a2x2 + ... + anxn + a0 = 0where a1, a2, ... an and a0 are constants, and x1, x2, ... , xn are variable.If there are only two variables then usually x1 = x and x2 = y.