The graph of a pair of linear equations in two variables is represented by two lines. (i) If the lines intersect at a point, then that point gives the unique solution of the two equations. In this ...

For example, 0 c + 1 r + 2 g = 10 turns into r = 10 – 2 g. Substitute that value for r in the other two equations and continue like this until you’ve defined all variables in terms of just one ...