3. Go to the [File] menu and move down to [New] and select [M-file]. An M- file is just a text file that contains MATLAB commands. Type in the commands given below, which create a function called GetLine, for returning the equation of a line that connects two input points. function [y,A,B) GetLine (x1, y1, x2, y2); function [y, A, B] = GetLine (x1, y1, x2, y2); If only one set of coordinates is entered, assume the second point is the origin at (0,0). if (nargin=-2) x2 = 0; y2 = 0; end m = (y2-yl)/(x2-x1);&m=slope of line by-axis intercept This function takes two sets of points: (x1, y1) and (x2, y2) and returns the equation of the line connecting them in the variable y. A and B are optional parameters that represent the smallest and largest x coordinates of the points entered. by2m*x2; syms x; y = m*x + b; A B return W- min (x1, x2); max (x1, x2); After you have typed in the commands, save this file as GetLine.m in the directory you created called mymatlab. When calling this function, notice that it returns three variables. If only one variable is given to hold the return value, only the formula of the line is returned. For example: » w = GetLine (2, 5, 1,7) A- -2*x+9 But if the lower and upper limits are needed, then call the functions using: » [w, A, B] = GetLine (2, 5, 1,7) -2*x+9 B = Define x as symbolic y the equation of line 1 A smallest x coordinate B = largest x coordinate 2

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3. Go to the [File] menu and move down to [New] and select [M-file]. An M- file is just a text file that contains MATLAB commands. Type in the commands given below, which create a function called GetLine, for returning the equation of a line that connects two input points. function [y,A,B) GetLine (x1, y1, x2, y2); fun