Consider a system of equations with two linear algebraic equations with the variables x and y. The substitution method in algebra is used to solve a system of linear equations by substituting the variables. For example 2x+3y=10 x-2y=-1 Solution x=2y+1 Substitute this value for the original variable in the other equation 2x+3y=10 2(2y+1)+3y=10 4y+2+3y=10 7y=8 y=8/7 If y=8/7 then  x=2y+1 x=2(8/7)+1 x=22/7