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+
+//voltmeters example

+clc;

+clear;

+close;

+clf();

+C=[1.9 2.75 3.8 4.8 5.8];

+K=[5.75 8.3 11.2 14 16.8];

+//C and K are connected by the law of the form K=mC+b

+plot2d4(C,K,3);

+plot(3.4,10,'r.pentagram');

+plot(5.3,15.5,'r.pentagram');

+xtitle("voltmeters graph","C","K");

+xgrid();

+legend("K=mC+b","POINTS A,B",2);

+//substituting A,B points in K=mC+b,we get

+//10=3.4m+b ------->equ(1) ; 15.5=5.3m+b ------->equ(2)

+//substracting

+m=(10-15.5)/(3.4-5.3);

+b=10-(3.4*m);

+mprintf("the law is: \n K=%fC+%f",m,b)