      Custom Search   Adding the equations would not eliminate either x or y. However, if we multiply both members of the second equation by - 1, then addition will eliminate x, as follows: The value of x is found by substituting 1 for y in either of the original equations, as follows: As a second example of the addition method, find the solution of the simultaneous equations Here both x and y have unlike coefficients. The coefficients of one of the variables must be made the same, except for their signs. The coefficients of x will be the same except signs, if both members of the first equation are multiplied by 4 and both members of the second equation by -3. Then addition will eliminate x. Following this procedure to get the value of y, we multiply the first equation by 4 and the second equation by -3, as follows: Substituting for y in the first equation to get the value of x, we have  This solution is checked algebraically by substituting 8 for x and -6 for y in each of the original equations, as follows: Practice problems. Use the addition method to solve the following problems:   