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4. Solve each system using the addition/elimination method. Express your final answer in solution set form. (3 points) -x+2y=-1 5x - 10y =6 1 (3 points) 7x + 6y = 2 - 28x - 24y = -8 5, Use a system of linear equations with two variables and two equations to solve the following. Write out your final answer using a complete sentence. a. Find two numbers whose sum is 28 and whose difference is 13. (3 points) b. A number is 9 more than another number. Twice the sum of the two numbers equals 10. Find the two numbers. (3 points)