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+//Example 3 Page 82
+clc
+clear
+C1=25000//assigning C1 value
+x1=30//Assigning x1 value
+C2=30000//assigning C2 value
+x2=40//assigning x2 value
+m=((C2-C1)/(x2-x1));//Finding the slopw
+disp(m,'the slope is')//displaying the slope value
+b=C1-m*x1;//Finding the intercept value
+disp(b,'the intercept b is')//dislaying the intercept value
+//therefore the function is C(x)
+function y=C(x)//function C(x)
+    y=500*x+10000
+endfunction
+
+x=[0 10 20 30 40 50]//assigning values of x for graph
+y=C(x)//function calling
+disp(x,'x:')//displaying x
+disp(y,'y:')//displaying y
+plot(x,y,'blue')//plotting graph in blue colour
+xtitle('','Number of Refrigerators','Cost(dollars)')//naming the axes
+
+