// Filename: lin_eq2.sg
// Solving 2 linear equations with 2 unknowns

var x1, x2;		 		// x1 & x2 are variables
unknown x1, x2;		 	// x1 & x2 are unknowns
equ x1 -> x1 + x2 = 4;      	// 1st linear equation
equ x2 -> 3*x1 + x2 = 7;	// 2nd linear equation
begin main		 		// Start of the function
solve;			 	// Solve the equations for the unknowns
open "answer" write;	 	// Open file “answer” to write
file write x1, x2;		// write x1 & x2 into answer
close;			 	// close the file
End			 		// End of the function